Mouth ulcers can be uncomfortable. They look similar to small blisters and can be caused by a tooth rubbing against the tongue or cheek, a lack of vitamin B12, anaemia or even stress. Treatment of ulcers is quite simple and they will usually heal within seven days. If they last for more than two weeks, you should go and see your dentist as they may be an early indication of something more serious.
If you have a mouth ulcer, you can help clear it up by using a special antiseptic mouthwash or pastilles. These are available from most pharmacies - just ask the pharmacist for advice.
Having a healthy diet can help prevent mouth ulcers and ensure you keep in good health generally. Remember to eat five portions of fruit and vegetables a day. If you have an ulcer, avoid citrus fruits and tomatoes as the acid may aggravate it.