Rinse with warm salt water 3–4 times a day
Use a baking soda rinse
Apply a topical oral gel for pain relief
Use a mouth ulcer paste or protective barrier gel
Avoid spicy, acidic, salty, and rough foods
Eat soft, cool foods
Drink plenty of water
Brush gently with a soft-bristled toothbrush
Use alcohol-free mouthwash
Avoid tobacco and alcohol
Suck on ice chips or ice pops
Take over-the-counter pain relief if needed
Use a vitamin B12, iron, or folate supplement if deficiency is suspected
Reduce stress and get enough sleep
See a dentist or doctor if ulcers last more than 2 weeks, are very large, or keep coming back