I would advise you to go for video counsultation... There can be many causes of pain or u can attach photograph also... Hope this will help you

Please attach the photographs of effected area. Without photographs it's difficult to understand your problem. Maintain good oral hygiene by brushing twice a day, Warm saline water rinses two to three times a day, use mouth wash.

I think you are reffering to the lower left wisdom tooth. Pain can be due to many reasons, food accumulation, gum infection, cavity are a few of them. So until I know the exact reason, it's difficult to give you an accurate remidy. Anyhow you can start lukewarm salt water rinse thrice daily and medicated mouthwash rinse twice daily for relief. Consult me on practo for complete medication