International Journal of Current Research and Review
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IJCRR - Vol 13 Issue 17, September, 2021

Pages: 51-55

Date of Publication: 12-Sep-2021


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Chronic Fluorosis: A Disease of Concern

Author: Mendez DC, Shashidhar KN

Category: Healthcare

Abstract:Introduction: Chronic fluorosis is a widespread disease caused by ingestion of high levels of fluoride through drinking water and food. Fluoride content in food depends on its concentration in water, soil and air. Aim: This review article is aimed at providing information about fluorosis and its ill effects. Objective: The objective is to address the adverse effect of fluoride on several organ systems besides the more commonly known skeletal and dental manifestations. Methodology: A detailed search of related literature has been carried out with the help of search engines. Pub Med and Research gate have been used for obtaining authentic information. Discussion and Conclusion: This review article summarizes the major deleterious health problems caused by fluoride and emphasizes that fluoride mitigation needs to be practised widely since fluorosis is a preventable disorder.

Keywords: Fluoride, Fluorosis, Toxic effects, Diabetes, Thyroid abnormalities, Cardiovascular system

Full Text:

Introduction

The 13th most abundant element in the earth’s crust is Fluorine.1It is only a microelement for human health but is one of the most significant endotoxins which appear in the environment.2 Fluoride is one of the few elements that have been shown to cause significant effects by various means such as through drinking water, air, dental products, food and beverages. Excessive fluoride in water and soil is mostly of geological origin which can be further compounded by over-exploitation of groundwater resources and Industrial pollutants.

 After absorption from the gastrointestinal tract (GIT), the ability of fluoride ions to easily penetrate the cells through the membrane results in affecting various functions by altering the activity of enzymes and hormones.3,4Fluoride not only accumulates in the bones and teeth but also gets deposited in the soft tissues.5 The level of fluoride, considered safe for humans is 1-1.5 mg/L while, prolonged ingestion is associated with dental fluorosis, skeletal fluorosis and several other disorders due to its ability to inhibit the proliferation of cells. It should be noted, however, that whileMicromolar Fluoride ion concentrations promote the growth and proliferation of cells, millimolar concentrations suppress cell proliferation and induce apoptosis in the hard tissues.6-9]. Many metals such as lead, copper and manganese can interact with Fluoride ion and contribute to increased accumulation of toxic elements and micronutrient deficiency in mammals.10,11

Effect on bones and teeth

Fluoride has proved to be highly effective in the prevention of dental caries. It gives long-lasting protection against dental decay. Regular fluoride exposure at the time of teeth development contributes to protection against dental decay. Plaque bacteria form organic acids, which dissociate releasing H+ ions and lower the pH in areas surrounding the tooth and finally leads to the release of calcium from the tooth.12Fluoride inhibits this demineralization and thus has a dental caries protection potential. Fluoride also has an antimicrobial effect as it inhibits carbohydrate metabolism in oral streptococci and lactobacilli as it inhibits the enzymes enolase and adenosine triphosphatase.13,14Though, it has beneficial effects on teeth and bones when present in low concentrations, excessive intake gives rise to adverse effects from dental fluorosis to the crippling skeletal fluorosis depending on the level of fluoride and the period of exposure. As the fluoride ion is strongly electronegative, it is attracted to the positively charged Ca ions in the teeth and bones.15 Fluoride alters the resorption of bone tissue and affects the homeostasis of bone mineral metabolism. Fluoride ion reacts with crystals of hydroxyapatite and forms a scaffold for the bones. A combination of osteosclerosis, osteomalacia and osteoporosis in varying degrees characterizes the bone lesions.16

The high affinity of Fluoride ion to mineralized tissues results in the high Fluoride ion concentrations in bones and teeth and so these materials are used as a bioindication of long term exposure to Fluoride.17,18 the earliest sign of chronic fluoride exposure is the characteristic mottling of dental enamel.

Effect on Thyroid Function

Excessive amounts of Fluoride interfere with the functioning of the thyroid gland. The thyroid gland is the most sensitive organ to the effect of fluoride.19

Since fluoride is more electronegative than iodine, it easily displaces iodine and thus affects the functioning of the thyroid gland. It is regulated by a negative feedback mechanism i.e. when the pituitary gland senses a drop in F T3levels in circulations; it releases more TSH which stimulates the thyroid gland to accelerate the production of T4. The Source of T3 is from peripheral deiodination of T4. The enzymes which bring about deiodination are known asiodothyroninedeiodinases and fluoride interfere with the activity of the deiodinases.20,21Thus, Fluoride increases the concentration of TSH and decreases the concentration of T3 and T4 hormones.

Effect on thyroid function was associated with a fluoride exposure level of 0.05 – 0.13 mg/kg/day when iodine intake was adequate and 0.01 – 0.03 mg/kg/day when iodine intake was inadequate.22

Effect on melatonin production

Animal studies on the effect of fluoride exposure to pineal glands show that it results in altered melatonin production and acceleration of sexual maturity. The reduced Melatonin production can impair the sleep-wake cycle. However, no studies on humans have been demonstrated.23, 24

Effects on Insulin secretion and Diabetes

Various studies have shown that insulin resistance in humans develops due to chronic fluoride exposure.23,24 Impaired glucose metabolism is associated with a serum fluoride concentration of 0.1 ppm or greater.25,26 Hyperglycemia induced by fluoride is mainly due to an increase in hepatic glycogenolysis.27 Fluoride inhibits the glycolytic pathway by inhibiting enolase resulting in increased accumulation of two phosphoglycerates which is equilibrated by three phosphoglycerate enzymes being phosphoglucomutase. As a result, blood glucose levels increase.28 Moreover, diabetic patients tend to consume larger quantities of water and this further leads to fluoride accumulation.29 This in turn leads to impaired renal function, increased capillary permeability and microcirculatory defects.30,31Invitro experiments on isolated Islets of Langerhans cells showed that the basal, as well as glucose-stimulated insulin, was found to be repressed as the fluoride concentration was increased.31

Fetal defects

Fluoride can cross the placental barrier into fetal tissue. It can affect the fetal brain tissue and this can cause neurological damage, neuronal degeneration and reduced secretion of norepinephrine. Fluoride also disrupts nerve cell receptors which can result in neural dysplasia.32 Fluoride has been found in the amniotic fluid in pregnant women living in areas of high fluoride concentrations and this result in fetuses being exposed to elevated fluoride levels.33

In mammalian cells, fluoride causes genetic damage through chromosomal aberrations at cytotoxic concentrations (≥10 mg/L) which may be due to the interaction of enzymes responsible for DNA synthesis or repair.34

 Effect on brain

A few epidemiological studies have shown lowered IQ levels in children exposed to 2.5 to 4 mg/L of fluoride in drinking water.35 Fluoride also tends to increase free radical production in the brain which may have a bearing in increasing the risk of developing Alzheimer’s disease and dementia.22,36 Experiments on mice have shown that chronic exposure to Fluoride brings about changes in learning, memory as well as neuropathological injury. It also raised the number of senile plaque, decreased levels of synaptic proteins and caused inflammation in the brain. This in turn could lead to an increased risk.37

Effect on Reproductive health

 Lowered fertility rates have been implicated with increased fluoride levels as prolonged fluoride exposure is associated with increased levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) and brings about decreased estrogen levels.38-40

Prolonged exposure to fluoride also leads to decreased testosterone levels and delay in its conversion to potent metabolites, disturbed androgen to estrogen rations as well as estrogen receptor to androgen receptor ratios.40 This effect on reproductive health is further compounded due to reduced thyroid hormones.41,42

Haematological effects

Chronic fluoride exposure brings about haematological effects such as anaemia, eosinophilia and dysplastic changes on granulocytes in the bone marrow.43Fluoride is also known to destroy probiotics in the gut, resulting in decreased production of Vitamin B12 which is required for Hemoglobin synthesis.44

Effect on Renal system

The kidney has a major role to play in the excretion of fluoride and the kidney tubules are also damaged due to uptake of fluoride.45 Prolonged exposure to high levels of fluoride increases the probability of developing renal diseases due to the structural and functional changes in the kidney such as swelling, degeneration of tubular epithelium, fibrosis and tubular necrosis. This in turn leads to increased serum creatinine and urea nitrogen.46

Effects on Gastrointestinal tract (GIT)

High concentrations of fluoride react with hydrochloric acid in the stomach to form hydrogen fluoride. The excessive formation of hydrofluoric acid results in irritation of the gastric mucosa.47As, Fluoride also stimulates secretion of gastric acid this, will diminish the blood supply in the stomach lining, resulting in death of epithelial cells in the GIT. Though, this observation has not been well documented in humans, adverse GIT symptoms are seen in areas of endemic fluorosis especially when the quality of nutrition is poor.48

Central Nervous System

Fluoride can cross the blood-brain barrier before birth and is believed to affect mental development. This can result in learning disorders and decreased intelligence in children. Reports of decreased levels of neurotransmitters have been seen in fluoride endemic areas.49

Fluoride brings about degenerative changes in the neural tissue which can lead to decreased memory and learning ability.46 The effect may be further compounded by deficiency of some elements such as iodine or the presence of other neurotoxic compounds as pollutants.49

Effect on Immunity

Chronic fluoride exposure affects cell-mediated and humoral immunity as it destroys white blood cell energy reservoirs thus affecting phagocytosis and inhibition of antibody formation.46

Effect on Reproductive system

The effect of fluoride on the reproduction system has not been investigated in detail though fluoride was indicted for decreased birth rates.50In one study, an interesting observation was that organic farmers who avoided pesticides were found to have double the average sperm density when compared to other farmers who used pesticides treated with fluoride.51High Fluoride levels are also known to be associated with reduced Testosterone levels.52

Effect on Cardiovascular system

Chronic fluoride exposure promotes inflammatory mechanisms. This in turn can lead to atherosclerosis and myocardial cell damage as oxidative stress, along with inflammation are important mechanisms involved in ischemic stroke. Fluoride also interferes with numerous enzymes resulting in elevating the risk factors for cardiovascular diseases besides, causing degeneration of the heart muscle.53-55 ECG of patients with dental fluorosis showed that a significant percentage of them had abnormal heart rhythms.56,57

Anaesthetic concerns in chronic fluorosis

In patients with fluorosis, there may be difficulty in intubation during anaesthesia due to the rigid cervical spine which is compounded with the limitation of movements of the intervertebral joints.58,59 There is also a greater degree of risk for postoperative respiratory complications due to restricted chest movement.58-60

Conclusion

Though fluorosis is a preventable disorder, it is unfortunately linked to several abnormalities which require attention. The various linked disorders of fluorosis need to be addressed. Combating fluorosis can be achieved by bringing about awareness, motivating and disseminating knowledge to the public on the avoidance of fluoride contaminated drinking water, arrangements of alternate sources of water, provision of fluoride-free drinking water, improving nutritional status and health education. Though some progress has been made, there is still a lot left to do. This review article is an attempt to disseminate information among medical practitioners and public health specialists.

Acknowledgements –

We gratefully acknowledge the scholars and scientists who have worked in the field of fluoride research and whose articles we have cited and included as references.

Conflict of interest –

The authors declare that there is no conflict of interest.

Source of funding - Nil

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A Study by Humaira Tahir et al. entitled "Comparison of First Analgesic Demand after Major Surgeries of Obstetrics and Gynecology between Pre-Emptive Versus Intra-Operative Groups by Using Intravenous Paracetamol: A Cross-Sectional Study" is awarded Best Article for Vol 14 issue 14
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A Study by Mardhiah Kamaruddin et al. entitled "The Pattern of Creatinine Clearance in Gestational and Chronic Hypertension Women from the Third Trimester to 12 Weeks Postpartum" is awarded Best Article for Vol 13 issue 08
A Study by Sarmila G. B. et al. entitled "Study to Compare the Efficacy of Orally Administered Melatonin and Clonidine for Attenuation of Hemodynamic Response During Laryngoscopy and Endotracheal Intubation in Gastrointestinal Surgeries" is awarded Best Article for Vol 13 issue 07
A Study by M. Muthu Uma Maheswari et al. entitled "A Study on C-reactive Protein and Liver Function Tests in Laboratory RT-PCR Positive Covid-19 Patients in a Tertiary Care Centre – A Retrospective Study" is awarded Best Article of Vol 13 issue 06 Special issue Modern approaches for diagnosis of COVID-19 and current status of awareness
A Study by Gainneos PD et al. entitled "A Comparative Evaluation of the Levels of Salivary IgA in HIV Affected Children and the Children of the General Population within the Age Group of 9 – 12 Years – A Cross-Sectional Study" is awarded Best Article of Vol 13 issue 05 Special issue on Recent Advances in Dentistry for better Oral Health
A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" is awarded Best Article of Vol 13 issue 06
A Study by Chen YY and Ghazali SRB entitled "Lifetime Trauma, posttraumatic stress disorder Symptoms and Early Adolescence Risk Factors for Poor Physical Health Outcome Among Malaysian Adolescents" is awarded Best Article of Vol 13 issue 04 Special issue on Current Updates in Plant Biology to Medicine to Healthcare Awareness in Malaysia
A Study by Kumari PM et al. entitled "Study to Evaluate the Adverse Drug Reactions in a Tertiary Care Teaching Hospital in Tamilnadu - A Cross-Sectional Study" is awarded Best Article for Vol 13 issue 05
A Study by Anu et al. entitled "Effectiveness of Cytological Scoring Systems for Evaluation of Breast Lesion Cytology with its Histopathological Correlation" is awarded Best Article of Vol 13 issue 04
A Study by Sharipov R. Kh. et al. entitled "Interaction of Correction of Lipid Peroxidation Disorders with Oxibral" is awarded Best Article of Vol 13 issue 03
A Study by Tarek Elwakil et al. entitled "Led Light Photobiomodulation Effect on Wound Healing Combined with Phenytoin in Mice Model" is awarded Best Article of Vol 13 issue 02
A Study by Mohita Ray et al. entitled "Accuracy of Intra-Operative Frozen Section Consultation of Gastrointestinal Biopsy Samples in Correlation with the Final Histopathological Diagnosis" is awarded Best Article for Vol 13 issue 01
A Study by Badritdinova MN et al. entitled "Peculiarities of a Pain in Patients with Ischemic Heart Disease in the Presence of Individual Combines of the Metabolic Syndrome" is awarded Best Article for Vol 12 issue 24
A Study by Sindhu Priya E S et al. entitled "Neuroprotective activity of Pyrazolone Derivatives Against Paraquat-induced Oxidative Stress and Locomotor Impairment in Drosophila melanogaster" is awarded Best Article for Vol 12 issue 23
A Study by Habiba Suhail et al. entitled "Effect of Majoon Murmakki in Dysmenorrhoea (Usre Tams): A Standard Controlled Clinical Study" is awarded Best Article for Vol 12 issue 22
A Study by Ghaffar UB et al. entitled "Correlation between Height and Foot Length in Saudi Population in Majmaah, Saudi Arabia" is awarded Best Article for Vol 12 issue 21
A Study by Siti Sarah Binti Maidin entitled "Sleep Well: Mobile Application to Address Sleeping Problems" is awarded Best Article for Vol 12 issue 20
A Study by Avijit Singh"Comparison of Post Operative Clinical Outcomes Between “Made in India” TTK Chitra Mechanical Heart Valve Versus St Jude Mechanical Heart Valve in Valve Replacement Surgery" is awarded Best Article for Vol 12 issue 19
A Study by Sonali Banerjee and Mary Mathews N. entitled "Exploring Quality of Life and Perceived Experiences Among Couples Undergoing Fertility Treatment in Western India: A Mixed Methodology" is awarded Best Article for Vol 12 issue 18
A Study by Jabbar Desai et al. entitled "Prevalence of Obstructive Airway Disease in Patients with Ischemic Heart Disease and Hypertension" is awarded Best Article for Vol 12 issue 17
A Study by Juna Byun et al. entitled "Study on Difference in Coronavirus-19 Related Anxiety between Face-to-face and Non-face-to-face Classes among University Students in South Korea" is awarded Best Article for Vol 12 issue 16
A Study by Sudha Ramachandra & Vinay Chavan entitled "Enhanced-Hybrid-Age Layered Population Structure (E-Hybrid-ALPS): A Genetic Algorithm with Adaptive Crossover for Molecular Docking Studies of Drug Discovery Process" is awarded Best article for Vol 12 issue 15
A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
A study by Raunak Das entitled "Study of Cardiovascular Dysfunctions in Interstitial Lung Diseas epatients by Correlating the Levels of Serum NT PRO BNP and Microalbuminuria (Biomarkers of Cardiovascular Dysfunction) with Echocardiographic, Bronchoscopic and HighResolution Computed Tomography Findings of These ILD Patients" is awarded Best Article of Vol 12 issue 13 
A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
A Study by Muhammet Lutfi SELCUK and Fatma entitled "Distinction of Gray and White Matter for Some Histological Staining Methods in New Zealand Rabbit's Brain" is awarded best article for  Vol 12 issue 11
A Study by Anamul Haq et al. entitled "Etiology of Abnormal Uterine Bleeding in Adolescents – Emphasis Upon Polycystic Ovarian Syndrome" is awarded best article for  Vol 12 issue 10
A Study by entitled "Estimation of Reference Interval of Serum Progesterone During Three Trimesters of Normal Pregnancy in a Tertiary Care Hospital of Kolkata" is awarded best article for  Vol 12 issue 09
A Study by Ilona Gracie De Souza & Pavan Kumar G. entitled "Effect of Releasing Myofascial Chain in Patients with Patellofemoral Pain Syndrome - A Randomized Clinical Trial" is awarded best article for  Vol 12 issue 08
A Study by Virendra Atam et. al. entitled "Clinical Profile and Short - Term Mortality Predictors in Acute Stroke with Emphasis on Stress Hyperglycemia and THRIVE Score : An Observational Study" is awarded best article for  Vol 12 issue 07
A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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