Canker sores | BMJ Best Practice

on the tongue and inside lining of the cheeks and lips. They are usually quite painful and last anywhere from 5 to 10 days. Causes of canker sores Types of canker sores 1. inor apthaeM – these are usually small ulcers (less . than 1cm in diameter) and appear as single or mul-tiple ulcers (1 to 5) on the underside of the tongue, floor of mouth or inside lining of the cheek. They heal ... ................
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