I posted last evening regarding pain in my right retromolar region. Till yesterday I couldn't see any physical signs of the pain but today I noticed that a canker sore/blister has formed on the inner cheek where a sharp edge of the impacted wisdom tooth is digging in. Since I won't have access to a dentist until mid June, I wanted to ask if there is any way to heal the blister. I have been doing warm salt water rinse as suggested. Is there a way to plane the sharp edge of the tooth? Or is the only option to remove the tooth?