If the teeth with braces hurt again after treatment, consider that it may be caused by local irritation, much cutting of the teeth, and the teeth are not cleaned. 1. Local stimulation: mainly after the braces treatment, the teeth encounter hot and cold will lead to dentin allergy, and disinfection drugs will also cause some stimulation to the teeth, usually the pain will gradually ease. 2. Dental cuts: often due to more dental cuts, resulting in the pulp of the teeth by external stimuli, it is easy to develop into pulpitis resulting in pain. 3. Teeth are not cleaned: If the teeth are not cleaned, there is still decay and continue to produce caries, causing toothache. After the treatment of the teeth with braces and pain, if the symptoms continue to be unrelieved, you need to go to the hospital in time to find out the cause.