If the tooth has been pustulated after braces, it may be caused by apical periapical inflammation, apical secondary infection, periodontal abscess, etc., and you need to go to the dental hospital in time to check the cause of the disease and then carry out symptomatic treatment. 1. Periapical infection: If the tooth is living pulp tooth before braces, and never showed any discomfort symptoms, and the tooth has been pus spots after braces, it is considered that the pulp received stimulation in the process of tooth preparation, resulting in pulp infection caused by periapical inflammation, you need to go to the hospital to take a panoramic film examination to confirm the diagnosis, and then dismantle the braces, and improve the root canal treatment, to be eliminated by inflammation and then re-do the braces. 2. Secondary infection of the root tip: If the tooth has completed root canal treatment before braces, and pus spots appear in the braces, it is possible that the root canal treatment is not complete, there are problems such as overfilling and underfilling, which leads to secondary infection of the root tip and causes pus spots, and it is necessary to remove the braces and carry out secondary treatment of the tooth before restoration. 3. Periodontal abscess: after braces have been pus point, there may be teeth originally exist periodontitis problem has not been resolved in a timely manner, the need for periodontal treatment of the teeth to improve the problem of pus point, if the pus point has not been able to eliminate, it may be necessary to extract the affected teeth and then do the porcelain crown and bridge restoration. It is recommended to go to a professional hospital for treatment.