Mouth sores often go away in 10 to 14 days, even if you don't do anything. They sometimes last up to 6 weeks. The following steps can make you feel better:
Mouth blisters are brought on by the herpes simplex infection. There are two sorts of the herpes simplex infection. The herpes simplex sort 1 infection (HSV-1) more often than not causes mouth blisters, and the herpes simplex sort 2 infection (HSV-2) commonly causes genital herpes.