White blisters on the gums may be fistulas caused by periapical lesions, mucosal ulcers, or herpes caused by viral infections, which should be treated accordingly according to the cause of the disease, including root canal treatment, medication, and so on. 1. If the fistula is caused by periapical lesion, root canal treatment should be carried out in time to eliminate the periapical lesion. Root canal treatment can clean up the infected dental tissues in the root canal, and thoroughly remove the necrotic tissues in the root canal and periapical area through preparation, disinfection, and filling of the root canal, so that the periapical lesion can be healed slowly. 2. If the mucosal ulcers are caused by simple trauma and other mechanical factors, the first step is to remove the irritating factors and apply iodized glycerin to astringe the wound to promote healing. 3. In case of viral infections, the type of virus should be identified by a healthcare provider, so that antiviral therapy, such as oral antiviral medications, ribavirin, acyclovir, and ganciclovir, can be administered accordingly. There may be other causes of white blisters on the gums, so it is important to go to your local healthcare facility and get the appropriate treatment for the cause of the problem, and to take the medications mentioned above as prescribed by your doctor.