American Dental Association: https://www.mouthhealthy.org/en/az-topics/c/canker-sores; American Academy of Oral Medicine: https://www.aaom.com/index.php%3Foption%3Dcom_content%26view%3Darticle%26id%3D82:canker-sores%26catid%3D22:patient-condition-information%26Itemid%3D120; iStock Photos; PhotoDune; AudioJungle

Burning or tingling spot in your mouth? A canker sore may be on the way.

They are not contagious, but you can have more than one at a time.

Common causes are: Acidic foods. Spicy foods. Skin that's already irritated. Being on your menstrual cycle.

Canker sores are really annoying but mostly heal on their own and don't leave a scar.

Some over-the-counter medicines may sooth the area.

If it's not better in 2 weeks, call your doctor.