Rinse your mouth with warm salt water several times a day
Avoid spicy, acidic, salty, and very hot foods
Avoid alcohol and tobacco
Use a soft-bristled toothbrush
Keep good oral hygiene
Drink plenty of water
Suck on ice chips to reduce pain
Use over-the-counter oral pain relief gels if suitable
Take over-the-counter pain relievers if needed and safe for you
Avoid biting or irritating the ulcer
Eat soft, bland foods
Check for sharp teeth, braces, or dentures causing irritation
See a dentist or doctor if it lasts more than 2 weeks
Seek medical care sooner if the ulcer is very large, recurring, or worsening
Seek urgent care if you have trouble swallowing, breathing, fever, or swelling