Hello. Kindly attach a clear photo of the affected region.
The stains could be intrinsic or extrinsic stains.
Extrinsic stains can be removed by professional teeth cleaning procedure called as scaling and polishing. However, if not maintained, stains and calculus (tartar) can get accumulated again over a period of time.
Intrinsic stains cannot be removed only by scaling and polishing, but would required teeth whitening procedures like bleaching. (Various bleaching procedures are available)
Kindly visit a dentist for definitive diagnosis and treatment
Next Steps
Kindly visit us at Dental Galaxy Pune for consultation or treatment http://dentalgalaxy.in/
Health Tips
Maintain proper oral hygiene. Brush twice a day using the correct brushing technique. Use a floss.