Colgate explains that tooth pain following a filling procedure is typically the result of the filling being placed too high, which causes pain when biting, or from the electric current between two fillings in the mouth, which occurs when teeth touch. Tooth sensitivity and pain caused by touching fillings fades on its own. However, it is necessary to visit a dentist for biting pain.
If a filling is placed too high, WebMD explains that it interrupts the bite of the teeth. If this is the case, then the pain develops immediately when the anesthesia wears off and continues over time. The filling needs to be reshaped at the dentist's office to fit properly. If a sharp pain occurs and is caused by an opposing tooth with a metal filling, the pain should resolve on its own within several days following the procedure.
In some cases, pain may be associated with decay deep in the tooth, according to WebMD. This pain resembles a toothache-type pain, and it indicates that the tooth is not healthy. WebMD advises that a root canal may be needed for this type of decay. Pain can also occur in surrounding teeth after a filling procedure due to the fixed tooth passing along its pain signals to other teeth. WebMD notes that this pain usually resolves on its own in about two weeks.