Canker sores heal alone in 1 to 2 weeks; fast relief comes from warm salt-water rinses, pharmacy numbing gels, and protective pastes that coat the sore.
A milk of magnesia dab soothes too. While it heals, dodge citrus, tomatoes, spice, salt, and scratchy foods, and switch to a soft toothbrush - an SLS-free toothpaste helps prevent recurrences in people prone to them. Big, stubborn, or frequently recurring sores earn a prescription steroid paste or rinse, which shortens them meaningfully. Get checked for sores past three weeks, unusually large or multiplying sores, or sores with fever or rash. Pymander is a free AI doctor, 24/7 by text, and can help you tell a canker sore from lookalikes.
What to do
Common questions
How do you get rid of a canker sore fast?
Canker sores heal on their own in one to two weeks, and nothing makes one vanish overnight - but you can cut the pain and protect it while it heals. Fast relief: warm salt-water rinses (half a teaspoon in a glass, a few times daily), pharmacy numbing gels with benzocaine applied directly, or protective pastes that coat the sore like a bandage. A dab of milk of magnesia as a rinse can soothe and neutralize acids. What to avoid while it heals: citrus, tomatoes, spicy and salty food, and sharp or crusty food that scrapes it. A soft toothbrush and SLS-free toothpaste help prevent the next one - sodium lauryl sulfate irritates some people's mouths into recurring ulcers. For big, stubborn, or frequently recurring sores, a clinician can prescribe a steroid paste or mouth rinse that shortens them significantly. Get checked for sores lasting past three weeks, unusually large or multiplying sores, sores with fever or rash, or ones that keep recurring - those can signal something systemic. Pymander is a free AI doctor, 24/7 by text, that can help you tell a canker sore from things it is not.