Gargle with warm salt water or an antiseptic mouthwash (such as povidone-iodine) a few times a day to ease your sore throat. Stay hydrated by sipping warm fluids, such as tea or soup. For mouth ulcers, apply a protective oral gel or antiseptic ointment, and avoid spicy, acidic, or rough foods. Take paracetamol to reduce pain and mild fever if needed. Please see a doctor if your symptoms worsen or do not improve.