Mouth breathing can have negative effects on dental arches. When a person breathes through their mouth, their tongue does not rest in the proper position, which can cause the jaw to grow improperly and result in a narrow dental arch. This can lead to crowding of the teeth and other problems with the teeth and jaw. Mouth breathing can also lead to dry mouth, which can increase the risk of tooth decay and gum disease. If you are concerned about the effects of mouth breathing on your dental arches, book an assessment to assess your Orofacial Myofunctional Disorders. See below for different arch forms. Do any of these look familiar?