The Mystery of Canker Sores
- Petras Dental
- May 5
- 1 min read

Almost everyone has dealt with a pesky canker sore at some point. These small, shallow ulcers can make eating and talking surprisingly painful. Unlike cold sores, canker sores are not contagious and appear on the soft tissues inside your mouth, like your cheeks or under your tongue.
While the exact cause can be a mystery, they are often triggered by stress, minor mouth injuries, or even certain acidic foods like citrus fruits. In some cases, a sensitivity to a common ingredient in toothpaste called sodium lauryl sulfate (SLS) can also be the culprit behind frequent outbreaks.
Most canker sores heal on their own within a week or two. To manage the discomfort, you can rinse with salt water or use over-the-counter numbing gels. Avoiding spicy or crunchy foods while the sore is active will also help prevent further irritation and speed up the healing process.
If you have a sore that lasts longer than two weeks or is unusually large, it’s a good idea to have it looked at. Sometimes frequent sores can be a sign of a vitamin deficiency or an underlying health issue that needs professional attention.
At Petras Family Dental in Amherstburg, we can provide treatments to help ease the pain of mouth sores and investigate why they might be recurring. We are dedicated to keeping your mouth comfortable and healthy. Contact us at 519-713-8985 or visit petrasfamilydental.ca/book to book your appointment





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