Mouth blisters, often called canker sores, can be quite uncomfortable. To get relief, you can apply an over-the-counter soothing gel containing benzocaine or choline salicylate directly to the sores. Regularly rinsing your mouth with warm salt water or a baking soda solution (1 teaspoon in half a cup of water) will help reduce inflammation and speed up healing. Avoid spicy, acidic, or very hot foods, as they irritate the blisters. Ensure you stay well-hydrated and consider taking a Vitamin B-complex supplement. If the blisters do not heal within two weeks, are extremely painful, or are accompanied by a fever, please consult a doctor.