It is possible to eat after a resin filling. The resin material is used for filling treatment, and the resin will be cured by a light-curing lamp during the treatment process. During the treatment process, the resin has completely cured and become very hard, so it is possible to eat immediately after a resin filling. If the pain or sensitivity is severe before the tooth is filled, it means that the cavity is already very large, the bottom of the cavity is close to the pulp nerve, or the nerve is already congested, etc. It is not recommended to eat immediately after the resin filling. It is not recommended to eat cold, hot or hard food as soon as possible after the resin filling is applied. It is necessary to let the nerve get enough rest and not to stimulate it excessively, so that the congestion of the pulp can be gradually relieved and the pulp can be restored to health before eating cold, hot or hard food. If the cavity is not too large before the filling, you will be able to use the tooth normally after the filling.