Orthodontics is a medical procedure with a long treatment time and many follow-up visits. Because of the complexity and length of treatment, the maintenance of dental hygiene is very important. In clinical practice, we often see orthodontic patients who do not pay attention to the maintenance of dental hygiene, resulting in many oral problems. Some can be solved by medical means; some even if solved will bring lifelong regret to the patient; and some problems can not be solved at all. The following pictures show some of the problems: Gingivitis. Caries in the neck of the tooth. Decalcification of the tooth neck. Deep caries in the neck of the tooth. Look at the above pictures, it is better to brush your teeth properly!