Efficacy of Botox Injection of the Masticatory Muscles in Head &Neck Cancer Patients with Trismus After Radiotherapy

Inclusion Criteria

• •1. Aged over 18 years old;
• •2. Head and neck cancer patients must have completed radiotherapy for at least 3 months;
• •3. Those whose mouth-opening distance is less than or equal to 3.5 cm (the functional cut-off point of trismus) and who have tightness or pain in the masticatory muscles;
• •4. Medical condition is stable;