A member asked:

Every time i accidentally knock my lips with my toothbrush (ex.) i almost always get a cancer sore! why does this happen?

3 doctors weighed in across 2 answers

Many causes: Sometimes a traumatic event can cause these apthous ulcers.

Answered 2/5/2013

5.3k views

Thank

Traumatic ulcer: Re-evaluate the way you are brushing. Discuss and show your dentist your motion and this can be corrected!

Answered 2/5/2013

5.3k views

Thank

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