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1) Mouth ulcers are a common condition that can be very painful. 2) They are usually caused by a break in the mucous membrane. 3) They can be caused by a number of different things, such as stress, hormones, or certain medications. 4) There are a few things you can do to help ease the pain of mouth ulcers, such as using a mouth rinse or taking pain relievers. 5) Mouth ulcers typically last for about a week. 6) However, if they last longer than a week or keep coming back, you should see a doctor. 7) Mouth ulcers are usually not a serious condition, but they can be very bothersome.