Dental crowding usually does not get worse gradually. The following conditions can gradually aggravate: 1. Wisdom tooth obstruction: Wisdom tooth is the third molar, mostly erupted at the age of 16-20. If the space for eruption is not enough, it can cause obstruction, and then the teeth appear crooked; 2, jawbone atrophy: jawbone can gradually shrink with age, if the jawbone atrophy is serious, the amount of bone is smaller than the amount of teeth, the degree of crowding can be gradually aggravated. It is recommended that the patient should consult the doctor in time after the discomfort occurs, and take corresponding treatment measures after the cause is clear.