Accepting professional and formal orthodontic treatment for adults has no side effects on teeth. Adverse symptoms in the process of adult orthodontic treatment generally come from informal operation and poor oral hygiene, as follows. 1. Informal operation: excessive orthodontic force may lead to excessive and rapid resorption of alveolar bone, severe loosening or even loss of teeth. Unreasonable program design may lead to occlusal abnormalities, serious early contact and joint interference, tooth wear and temporomandibular joint disorders. 2. Poor oral hygiene: Inadequate maintenance of oral hygiene may lead to accumulation of plaque, periodontitis or caries. If the above symptoms occur, it is recommended to go to the hospital in time for targeted treatment. In addition, it is best to find a professional hospital for orthodontic treatment for adults.