Breathing through the mouth (and not the nose) causes many issues including dental crowding, high arched and narrow palate, crooked teeth, and increased anterior facial height. This is because tongue placement is extremely important in guiding the growth of the jaws and the face. If dental issues are left untreated and we wait too long,  extractions of adult teeth and even surgical interventions are often needed. Poor body posture usually accompanies mouth breathing as well. Correcting tongue position while resting, mouth breathing habits, and poor body posture is critical in achieving proper growth of the upper and lower jaws, face, and overall health of a developing child