Rinse with warm salt water several times a day
Use a baking soda rinse
Apply an over-the-counter numbing gel or oral paste
Avoid spicy, acidic, salty, or rough foods
Drink cool water and stay hydrated
Brush gently with a soft-bristled toothbrush
Use an alcohol-free mouthwash
Avoid chewing gum and tobacco
Take over-the-counter pain relievers if needed
Protect the sore with an oral barrier paste
Try ice chips or cold foods to reduce pain
Manage stress and get enough sleep
See a dentist or doctor if it lasts more than 2 weeks, is very large, keeps coming back, or is accompanied by fever or trouble eating or drinking