Which is the hardest mineral in the body?

 It is calcium phosphate, which forms tooth enamel. Like bones, tooth enamel is made from crystals of calcium phosphate.

Demineralisation occurs when the bacteria that are normally found in the mouth use the sugars and carbohydrates from the food we eat to produce acids that dissolve the tooth structure, depleting it of calcium and phosphate.

Remineralisation occurs when the level of calcium and phosphate is increased in the tooth structure, promoting strong, healthy teeth. The demineralisation and remineralisation process is continuous and can be influenced by diet, saliva and oral hygiene.