A member asked:

Why do i keep getting reoccuring canker sores, some appear on the tip of my tongue and some appear on the inside of my upper cheek. what's wrong?

A doctor has provided 1 answer

Canker sores: The exact cause of canker sores is unknown., but they are related to stress and sometimes vitamin deficiencies, hormonal related, or autoimmune problems. Some people are sensitive to SLS in many toothpastes. Try switching to an SLS free toothpaste. Read the labels.

Answered 1/20/2017

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