Traditional Chinese Medicine Oral Liquids and Mouthwashes for Radiation-induced Oral Mucositis in Head and Neck Cancer Patients

This study is testing whether a Traditional Chinese Medicine oral liquid and mouthwash can reduce or prevent mouth sores (oral mucositis) — a painful and common side effect of radiation therapy — in patients with head and neck cancer. **You may be eligible if...** - You are between 18 and 65 years old - You have been diagnosed with a non-metastatic head or neck cancer confirmed by biopsy - You are scheduled to receive radiation therapy or combined radiation and chemotherapy - Your general health and organ function are adequate - Your ECOG performance status is 2 or below (able to carry out basic daily activities) **You may NOT be eligible if...** - You have a history of multiple drug allergies - You plan to use certain drugs that can worsen mouth sores (such as anti-EGFR antibodies or immune checkpoint inhibitors) during radiation - You used antibiotics, antifungal drugs, or antimicrobial mouthwash in the past month - You have poor oral hygiene or severe gum disease Talk to your doctor to see if this trial is right for you.