Breathing through the mouth is caused by nasal congestion, such as turbinate hypertrophy, sinusitis, hyperplasia and polyps.

The harm of breathing through the mouth is that the face changes, the teeth protrude and the chin retracts. The solution is to treat respiratory diseases first, change respiratory stenosis, correct teeth, and then talk about chin according to the situation. Moving the mandible is also a traumatic operation with great risks.