Hello.. the reason for ur pain in mouth as well as heard he might b the wisdom tooth which is trying to erupt
But due to lack of space it’s applying pressure n causing u the discomfort
Next Steps
Get n X-ray n get it removed
Health Tips
Till then u can do warm saline rinse 3-4 times a day, will help in swelling of gums also
Do cold fomentation if any swelling appears from outside ur jaw( do not do hot compression as it might aggregate the pain)
Use mouthwash to avoid any infection due to food lodgement
Try to keep that area clean