To restore a tooth damged.

A filling is a way to restore a tooth damaged by decay back to its normal function and shape. Fillings are also used to repair cracked or broken teeth and teeth that have been worn down from misuse (such as from nail-biting or tooth grinding). When a dentist gives you a filling, he or she first removes the decayed tooth material, cleans the affected area, and then fills the cleaned-out cavity with a filling material.