A tooth filling is a dental procedure used to restore a tooth that has been damaged by decay or injury. During the process, a dentist removes the decayed portion of the tooth and fills the empty space with a material such as composite resin, amalgam, or ceramic. This helps to prevent further decay and restores the tooth's function. Fillings can also be used to repair cracked or broken teeth. The choice of filling material depends on factors like the location of the tooth, the extent of damage, and patient preferences. Regular dental check-ups can help identify the need for fillings early on.