|
|
|
|
|
What are they? |
A mouth ulcer or canker sore is a painful open sore inside the mouth caused by a break in the mucous membrane. The condition is also called aphthous stomatitis or aphthous ulcer, especially if there are multiple or recurring mouth ulcers.
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
