Does having deep overbite affect your breathing?

It can: A deep overbite can contribute to a blocked airway in some circumstances. If that is the case, positioning the mandible forward and opening the bite with a dental appliance can be helpful.A thorough evaluation by a dentist experienced in this area is essential.

Possibly: Many factors can cause this problem, including a high "vault" and a constricted maxillary arch, which can affect your nasal passages. Have yourself evaluated by a dentist to determine if orthodontics can help you.

Not of and by itself: your overbite, however, may be indicative of a more complex malocclusion. Overbite often seen with high narrow palatial vault. Overbite often seen with recessive lower jaw. Both will compromise airway. Occlusion, jaw relationships, airway, may require collaborative treatment by both Orthodontist and Oral Surgeon. Go find out.