Cheek swelling permanent for 2 years and dryness of mouth can be due to pathology related to parotid gland.
Because of molar cavity,there is presence of sharp edges of tooth,on continuous interference of tongue to the sharp edge of tooth may produce pain/ulceration in tongue.
Next Steps
get molar cavity treated without further negligence
look into the facial swelling eeason. at right side of face, can be due to parotid gland pathology
Health Tips
do not do hot compression /balm/ointment application extra-orally.
avoid very hot/cold/hard/sweet/sticky food
soft diet
do not neglect brushing after meal.