Mouth blisters are brought about by a typical infection called herpes simplex. They can spread from individual to individual through close contact, for example, kissing. The injuries are infectious notwithstanding when they aren't obvious.
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:
For canker sores: