What Is a Mouth Ulcer?
5. How Long Do Mouth Ulcers Normally Last?
How long a person may have a mouth ulcer depends on the type and size. In general, canker sores often take between two and four weeks to completely go away. However, more severe cases may leave behind scars on the gums.
Herpetiform ulcers often have the fastest healing time, recovering in as soon as one week. Minor ulcers take approximately two weeks to heal and major ulcers on average take three weeks to fade. It is possible for these lesions to last longer than three weeks in more severe cases.
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