This guide educates patients about dental care after head and neck radiation therapy, explaining how radiation damages salivary glands causing dry mouth, increased tooth decay risk, and poor wound healing including osteoradionecrosis. It provides comprehensive oral hygiene instructions including baking soda gargling, fluoride toothpaste use without rinsing, daily flossing, low-sugar diet recommendations, and emphasizes regular dental check-ups to prevent complications and maintain oral health.