1 You can get a mouth ulcer from kissing or sharing a drink.
False! Mouth ulcers are not infectious.
2 Certain foods can cause a mouth ulcer.
True! These include acidic vegetables and fruits, such as pineapple and strawberries.
3 Mouth ulcers are extremely common.
True! Around one in five adults suffer from recurrent mouth ulcers.
4 A cold sore is another name for a mouth ulcer.
False! Cold sores are caused by the herpes simplex virus and are highly contagious.