Can gingivitis cause canker sores

Gingivitis does not directly cause canker sores, because gingivitis is gum inflammation while a canker sore is a separate ulcer of the mouth lining.

Gingivitis affects the gum margin around teeth, whereas a canker sore usually forms on movable cheek, lip, or tongue tissue. They can occur at the same time, but one does not ordinarily turn into the other.

Brush gently at the gum line, clean between teeth, and avoid irritating an ulcer with spicy, acidic, or rough foods. Note where the sore is and whether bleeding, plaque, swollen gums, or a sharp tooth is present.

See a dentist if gum bleeding and swelling persist after careful cleaning, or if an ulcer lasts beyond two weeks, keeps returning, is unusually large, or comes with fever or difficulty swallowing.

Ask whether the gum changes fit plaque-related gingivitis, whether the ulcer has another cause, and whether a sharp filling, appliance, medication, or cheek injury needs correction.