1. For mild dentition crowding, the correction of mild dentition crowding is often manifested as torsional dislocation of upper and lower incisors or slight labial dislocation of canines, and braces are generally used for orthodontic correction.

2. For the treatment of moderate and severe dentition crowding, the combination of meiotic extraction and appliance is generally used to treat moderate and severe dentition crowding. Because the growth and development of adults have been completed, the metabolic rate has slowed down and the biological reactivity has decreased, it will take longer for orthodontics to correct adult tooth crowding than for children.

3. When teeth are crowded, beauty crown can also be used for orthodontics. Meiguan takes less time to correct tooth congestion than wearing braces, which avoids the embarrassment of nursing difficulties in the process of tooth congestion correction. However, this method is only suitable for the correction of mild and moderate tooth congestion, and there are requirements on age limit, which is only suitable for adults.