In the pre-enrollment phase, patients at Lane and Associates Family Dentistry will complete a standard TMD screening questionnaire. Those screening positive will be clinically examined against Research Diagnostic Criteria for TMD to confirm Group II: Masticatory Muscle Disorders, 1A: Myalgia. They will also be screened for OSA using the validated STOP-BANG questionnaire. Those at high risk will be referred for evaluation by a sleep physician and a diagnostic PSG, as is the standard of care at Lane and Associates. If the PSG reveals mild to moderate OSA (apnea-hypopnea index (AHI) ≥5 and <30), the patient is a candidate for oral appliance therapy, pending confirmation of the sleep physician, and thus eligible to enroll in the study.