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How long does a canker sore last? This is one of the first questions we ask ourselves when faced with this small, painful ulcer that appears inside the mouth. In the vast majority of cases, a benign canker sore heals on its own within one to two weeks, without leaving a scar. Its duration mainly depends on its size, location and the irritation it is exposed to daily.
key points to remember
- A typical canker sore smaller than 1 cm lasts an average of 7 to 14 days and disappears spontaneously.
- Pain is most intense during the first 2 to 3 days, then subsides as the lesion heals.
- A giant canker sore may take several weeks to heal and leave a small mark.
- A canker sore that persists for more than 3 weeks should be examined by a dental surgeon.
How long does a canker sore last depending on its type?
The duration of a canker sore is not the same for everyone, as there are several forms. A minor canker sore, the most common type, measures a few millimeters and generally closes up in less than two weeks. This is the form most people experience once or twice a year.
A major canker sore, or giant canker sore, is more than one centimeter wide and develops deeper in the mucous membrane. It heals more slowly, sometimes over three to six weeks, and may leave a fine scar. Herpetiform canker sores appear in small groups of tiny lesions which, as a group, also take one to two weeks to disappear.
To fully understand what a canker sore is and what triggers it, it is useful to know about these different forms: its location on the tongue, cheek or gum also affects how it feels and how long it takes to heal.
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The stages of canker sore healing
A canker sore almost always follows the same course, over a few clearly identifiable days. Knowing these stages helps you understand where you are in the process and avoid unnecessary worry during healing.
- Tingling (day 0). A burning or tingling sensation signals the canker sore even before it becomes visible.
- Appearance (day 1). A round ulcer with a white or yellowish center, surrounded by a red border, forms.
- Painful phase (days 2 to 3). Pain is at its worst, especially when the sore comes into contact with acidic, spicy or crunchy foods.
- Healing (days 4 to 10). The center of the lesion becomes lighter and the pain decreases significantly.
- Recovery (days 10 to 14). The mucous membrane closes up and returns to its normal appearance, without leaving a trace in the case of a minor canker sore.
How can you speed up the healing of a canker sore?
You cannot make a canker sore disappear in a day, but you can reduce the pain and avoid prolonging it. The first step is to limit irritation: avoid acidic foods such as citrus fruits or vinegar, spicy or very salty dishes, and choose lukewarm, soft foods while the lesion closes up.
Gentle but regular oral hygiene helps limit secondary infection and supports healing of the mucous membrane. Brushing gently avoids rubbing the sensitive area: the Y-Brush sonic toothbrush cleans all the teeth in ten seconds per jaw with soft filaments, reducing the risk of irritating a canker sore while brushing. Y-Brush is 2× more efficient than traditional electric toothbrushes, according to tests conducted by Y-Brush (see the clinical studies): this brushing that is 2× more efficient than a traditional electric toothbrush helps keep your mouth healthy without irritating fragile mucous membranes.
A gentle antiseptic mouthwash, or a solution made with water and baking soda, may also soothe the pain. These measures do not dramatically speed up healing, but they make the wait more comfortable and prevent the lesion from getting worse.
When should a long-lasting canker sore be a cause for concern?
Duration is an important sign. An isolated canker sore that does not heal after three weeks, grows, bleeds or keeps returning in the same place should not be ignored. Similarly, numerous canker sores accompanied by fever or unusual fatigue warrant medical advice.
