Inclusion Criteria:  10-15 years old registered orthodontic patients able to undergo routine orthodontic care and are registered to obtain an orthodontic appliance in the future. do not have a high care need no known hypercapnia or hypoventilation no known allergies or nose blockages diagnosed as Class II Division I (=6mm of overjet) and bilateral Class II half cusp or unilateral Class II full cusp.  Exclusion Criteria:  known hypercapnia or hypoventilation patients with hypertrophic tonsils and adenoids patients with allergies or nose blockages that interfere with breathing patients who are not registered as orthodontic patients at research sites deemed acceptable to undergo routine orthodontic care