Mouth ulcers, or canker sores, are small, painful sores that form inside the mouth, on the tongue, or lips. They are not harmful but can make eating, drinking, and talking uncomfortable. Several ...

Medically reviewed by Brian T. Luong, DMDFact checked by Nick BlackmerMedically reviewed by Brian T. Luong, DMDFact checked by Nick Blackmer Using a saltwater rinse can help heal gums and improve oral ...