Bad teeth according to the size of dental tissue defects, can be filled or braces treatment, but the specific treatment is recommended to visit the doctor after the doctor to determine according to the condition. 1. If the area of dental caries defect is small, and there is no obvious conscious symptoms, you can directly carry out caries filling and repair; that is, the defective part of the oral restorative materials (such as tooth powder or resin, etc.) directly filled and repaired, due to the small area of the defect after filling the material is not easy to fall off the chipping and other symptoms. 2. If the defective area of the tooth is large and even requires root canal treatment (i.e., nerve extraction treatment), the direct filling and restoration is prone to material dislodgement; therefore, it is recommended to carry out a full-crown prosthesis, i.e., wrapping the tooth with a dental sleeve to prevent it from cracking and other situations. For specific treatment options, please consult a medical professional.