If the tooth is too short for braces after root canal treatment, it is necessary to check the occlusion of the oral cavity and consider the restoration of the crown or extraction. 1. Pile and crown restoration: If the tooth is too short for braces after root canal treatment, you can first play metal or fiber piles in the root canal, extend them towards the crown to form the shape of the crown, and then perform crown restoration after bonding. 2. Extraction: If the tooth is too short after root canal treatment, and if it is assessed to be too short for crown restoration, it needs to be considered for extraction and then restored with a movable or fixed prosthesis. If the tooth is too short after root canal treatment, it is recommended to go to the hospital to check the occlusal condition of the mouth and the specific condition of the tooth before making targeted treatment.