A mouth ulcer is a circular white spot in the mouth surrounded by a red ring. It is caused when anything damages the lining of the mouth – which is delicate and sensitive – exposing the nerves just below the surface. Anything that touches them - food, liquid – can cause pain, making it uncomfortable to eat, drink, talk or kiss, even though they are not contagious.

The main cause of mouth ulcers is accidental damage caused by minor burns from hot food and drinks, biting the inside of the mouth accidentally, a tooth that's become rough, or orthodontic braces that rub against the gums. If you are feeling stressed or under the weather you may also develop an ulcer. Other more serious causes of mouth ulcers include herpes infection, inflammatory bowel disease, immune disorders or oral cancer.

Make sure you practice good dental hygiene and make sure you don’t damage your teeth and gums when brushing. Visit the hygienist every six months for a check-up or if your mouth ulcer persists for more than three weeks, make an appointment to see your dentist. You also need a healthy diet that enables your immune system to stay strong and resist infections. Avoid food and drinks that are too hot and try to relax and reduce your stress.