Evaluating a Low-Cost Therapeutic Device in Managing Head and Neck Cancer Patients With Radiation-Related Trismus

PRIMARY OBJECTIVE: I. To assess the clinical efficacy of the trismus device, as measured by the change in maximum interincisal opening over the six-week treatment period. SECONDARY OBJECTIVE: I. To assess participants compliance rates and jaw opening pressures when using this device. OUTLINE: Participants are assigned to 1 of 2 parts. PART I: Participants test the trismus device and complete questionnaires on study. PART II: Participants undergo exercise therapy with the trismus device under supervision of a speech language pathologist on study. Participants will be on study for up to 6 weeks with a follow-up visit 7 days after completion.