Rinse your mouth with warm salt water several times a day
Use a baking soda rinse to reduce irritation
Avoid spicy, acidic, salty, and rough foods
Drink plenty of water
Use a soft-bristled toothbrush
Avoid alcohol-based mouthwash
Apply an over-the-counter oral gel or protective paste
Take pain relievers if needed and safe for you
Eat soft, cool foods
Avoid biting the ulcer or irritating it with dental products
Manage stress and get enough sleep
Check for possible triggers such as certain foods, braces, or sharp teeth
See a dentist or doctor if ulcers are large, very painful, frequent, or last more than two weeks