S.No

Fluoride in drinking water (mg/l) Effect

Effects

1

1 mg/l in water

Dental caries reduction

2

2 mg/l in water

Mottled enamel

3

0.002 in air

Injury to vegetation

4

50 mg/l in food or water

Change in thyroid harmone

5

20 - 80 mg/day or more

Crippling skeletal fluorosis

6

8 mg/l in water

10% osteoporosis

7

More than 125 mg/l

Kidney change

8

100 mg/l in water or food

Retardation in growth

9

3.1 - 6 mg/l in water

Osteoporosis

10

2.5 - 5.0 gm in actual dose

Death