Table 3.

Distribution of water fluoride concentration, community fluorosis index values and objectionable dental fluorosis according to study area

Villages	Fluoride concentration in drinking water (ppm)	Community fluorosis index value	Objectionable dental fluorosis (%)
North Pichavaram	0.25†	0.16†	0.00
T.S. Pettai	0.56†	0.18†	0.77
South Pichavaram	0.66†	0.27†	1.74
Senjicherry	0.67†	0.43†	5.63
Kanagarapattu	<0.1	0.54	1.42
Keezhaperambai	<0.1	0.54	4.84

^†rho = 0.99; P < 0.001