1. It is required for normal mineralisation of bone.
2. Also required for the formation of dental enamel.
Sources: Drinking water, sea fish, cheese and tea.
Deficiency and excess:
Deficiency of fluorides produces dental canes. Excess of fluorides in drinking water leads to dental and skeletal fluorosis.
The recommended fluoride intake in water is 0.5 to 0.8 mg per liter.