A filling is a method to restore a tooth damaged by decay back to a healthier function and shape. By closing off the area where the decay resides, the dentist can then prevent additional decay from happening.
Your dentist will need to remove decay from the tooth before inserting a filling, using a local anesthetic to help with any mild pain. By closing off the area where the decay resides, the dentist can then prevent additional decay from happening.
Different fillings require an array of procedures to make sure they will fit properly and stay that way, and your dentist may put in a liner or base within the tooth to protect the nerves.