How can you get rid of the sores in your bf's mouth?

Use Canker Cover. Painful mouth sores are usually canker sores (aphthous ulcer) which are found on the inside of your cheek, under your tongue, the tip of your tongue, or the roof of your month. They will usually go away in 7 - 10 days. There are many natural remedies, but i like canker cover by quantum health, which is a patch that will cover the sore. If you have a lot of sores you should see your dentist.