The correct term for braces is full crown restorations. The possible causes of toothache six or seven days after making full crown restorations are dentin hypersensitivity, pulpitis, etc., as follows. 1. Dentin hypersensitivity: If the affected tooth is a living pulp tooth, after tooth preparation, the dentin is exposed. If the adhesive performance is poor or the adhesive operation is not good, the edge of the restoration is not close or even the restoration is loosened, it will stimulate the dentin and lead to dentin hypersensitivity causing pain. 2. Pulpitis: Generally, the pulp is stimulated and develops into pulpitis due to excessive cutting of the tooth, failure to wear temporary crowns before cementation and failure to appease the pulp, which causes tooth pain. There may be other reasons for toothache six or seven days after making a full crown restoration, so it is recommended to go to the hospital in time.