Section 8. Mouth and Dental Disorders

Chapter 112. Mouth Sores

Topics: Introduction | Canker Sores | Oral Herpes Simplex | Other Mouth Sores

Introduction

Mouth sores vary in appearance and size. Some may be raised, usually filled with fluid (in which case it is called a vesicle or bulla); others may be ulcers. An ulcer is a hole that forms in the lining of the mouth when the top layer of cells breaks down and the underlying tissue shows through. An ulcer appears white because of the dead cells and food debris inside the hole.

Sores can affect any part of the mouth, inside and outside. Canker sores and cold sores are perhaps the most well known, but there are many other types and causes of mouth sores. Any sore that lasts for 10 days or more must be examined by a dentist or doctor to ensure that it is not cancerous or precancerous (see Section 8, Chapter 113).