Hello mam
This problem usually occurs if there is a remnant of milk tooth retained and is not completely shed. Also, it could be a part or extension of your permanent tooth. It would have been better if you could post a pic here.
The best approach is to visit a good dentist for proper diagnosis. The treatment could be extraction of remnant tooth or grinding depending upon diagnosis.
Next Steps
visit a clinic and get the check up done.
Health Tips
x ray to be done if required