A dental filling is a common 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 restore the tooth's shape, function, and appearance. Fillings are important for preventing further decay and protecting the tooth from bacteria. They can last several years, depending on the material used and the patient's oral hygiene practices. Regular dental check-ups can help ensure that fillings remain in good condition.