Rinse your mouth with warm salt water several times a day
Use a baking soda rinse to help reduce irritation
Avoid spicy, acidic, salty, and crunchy foods
Drink cool water and stay hydrated
Use an over-the-counter oral numbing gel or protective paste
Brush gently with a soft-bristled toothbrush
Avoid alcohol-based mouthwashes
Suck on ice chips or cold treats to reduce pain
Take over-the-counter pain relievers if needed
Avoid biting or irritating the sore
Use a topical steroid oral treatment if prescribed by a doctor or dentist
See a doctor or dentist if it lasts more than two weeks, is very large, or keeps coming back