hello and welcome to hcm forum ,
i would be glad to answer your query,
i would like you to know that pain in the cheek and gums is following cheek biting
which may have occurred accidentally while grinding of teeth.
i advise you to see a dentist
, you will require a night gaurd which will prevent teeth grinding and cheek biting.
until you see a dentist, kindly use warm saline to rinses(3-4 times/day), this will relief pain.
also, you may use an antibacterial mouthwash(twice/day),
a topical gel (dologel-CT),if applied once/day over the affected area only ,half an hour before meals will provide pain relief.
i hope i answered your query.
i wish you good health,