If you are having mild pain or sensitivity , it means tooth decay is already started. So it's better to get it treated by doctor
Next Steps
(-) Visit near by dentist
(-) You can apply some tooth desensitize toothpaste like vantej on affected tooth
(-) Use warm saline water rinses
(-) Use some soft bristle toothbrush
(-) Ketorol DT for mild pain (SOS)
Health Tips
Visit dentist, because now it is mild pain, but it can aggravate. so it's better to get treatment properly.