painful reddish lesions in the mouth that have a white or yellow center. Some causes of canker sores are spicy/acidic foods, vitamin deficiencies, braces, and stress. Most canker sores resolve on ...

Mouth ulcers, also known as canker sores ... accidental injury from dental work, or irritation from braces or sharp teeth. - ...

If your mouth sore lasts longer than two or three weeks ... Use a soft toothbrush to avoid irritating your gums. If you wear braces, cover any sharp edges with wax. Keep calm and avoid stress.