CORRELATION OF DRINKING WATER FLUORIDE LEVEL WITH PREVALENCE OF DENTAL FLUOROSIS VS DENTAL CARIES

In the developed western world the drinking water is fluoridated with the belief that it would prevent Dental Caries. Instead, Dental Caries and Dental Fluorosis co-exist in the same population where the drinking water is naturally contaminated with fluoride. The incidence of Dental Caries and Dental Fluorosis co-exist when drinking water fluoride content is above 0.5 ppm and that is the observation in India and many other countries.

The data reported in Table 3 & 4 supports the above statement. Increase in fluoride content in water has no beneficial effects and the incidence of Dental Caries remains the same.

Table - 3
Case Study 1:      Incidence of Dental Fluorosis vs Dental Caries in Salem district
of Tamil Nadu in South India

mg F/litre in
drinking water

Incidence of Dental Fluorosis
(in percentage)

Incidence of Dental Caries (in percentage)

0.5-0.9

99

14

0.1- 1.4

95

16

1.5- 1.9

97

15

2.0 - 2.4

99

16

2.5-2.9

99

13

3.0-3.4

99

28

3.5-3.9

100

19

4.0 - 4.5

-

-

5.0 and above

100

19

Average

98

16

Source of Information: 
B.P. Rajan and N. Gnanasundaram, Madras Dental college, Tamil Nadu 1989.(Report: Ministry of Environment and Forests, Government of India 1989)

Table - 4
Case Study 2:                   Incidence of Dental Fluorosis vs Dental Caries in Dharmapuri district
in Tamil Nadu in South India

mg F/litre in
drinking water

Incidence of Dental
Fluorosis (in percentage)

Incidence of Dental Caries (in percentage)

0.5 - 0.9

88

20

0.1-1.4

90

15

1.5-1.9

98

13

2.0 - 2.4

98

29

2.5 - 2.9

97

30

3.0-3.4

98

20

3.5 - 3.9

97

24

4.0 - 4.5

95

-

5.0 and above

97

26

Average

95

20