Gargle & Mouthwash: Adults and children over 6 years of age: Use undiluted or diluted with an equal volume of warm water. Gargle or rinse with up to 10 mL for up to 30 seconds without swallowing. Repeat up to four times daily, for up to 14 consecutive days, or as advised by the Registered Dental Surgeon/Physician. Povidone Iodine may cause hypersensitivity reactions and irritation of the skin and mucous membranes. The application of povidone Iodine to severe burns or to large areas otherwise denuded of skin may produce systemic adverse effects such as metabolic acidosis, hypernatraemia, and impairment of renal function. It may interfere with thyroid function tests.