Aim: The aim is to understand the alteration in the salivary flow, pH, and oral hygiene in patients undergoing radiotherapy. Objective: I) To compare the SFR in patient undergoing radiotherapy with normal controls II) To determine the pH in the content of saliva III) To assess oral hygiene using oral health index Materials and Method: A cross-sectional study was conducted among patients undergoing radiotherapy in Dr.Raii Cancer Institute, Chennai, Tamil Nadu, India. A total convenience sample

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... 20 adults aged between 24 and 60 years were selected, out of which 10 adults were undergoing radiotherapy for head and neck cancer and 10 age and sex matched controls. Conclusion: Hence this study evaluates the salivary flow rate, pH and oral hygiene of patients undergoing radiotherapy, which is important for dental professionals to familiarize with these complications of radiotherapy to treat patients effectively to improve their quality of life.