Aphthous ulcers: See the following site for an in depth answer to your question: http://www.mayoclinic.org/diseases-conditions/canker-sore/basics/definition/con-20021262
Answered 5/23/2014
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Canker Sore: is very common after tooth extraction. Canker sores are the most common oral lesions. Individual ulcers typically last 1-2 weeks. The condition is idiopathic (cause is not known) recurrent aphthous ulcers is usually self-limiting. If concerned see your dentist after 10 days.
Answered 5/24/2014
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