A filling is a way to restore a tooth damaged by decay back to its normal function and shape. Decay causes cavities or holes in your tooth where bacteria can enter and grow.
To prevent further damage, a dentist can place a filling to close off space where bacteria can enter, the decayed part of the tooth will be removed and cleaned and then the cavity will be bonded and filled with a filling material. This also can help prevent further decay.
Materials used for fillings include white tooth coloured composite and silver amalgam.