If ur stains are black and permanent u can get a treatment done called macroabrasion technique very straight forward technique

This is due to poor oral hygiene. Scaling and polishing has to be done.

Hello Kindly post the pictures for the correct diagnosis. Black scales can be both temporary or permanent. In case, it’s temporary, it can be due to staining ( tea/coffee) , iron intake, or increased iron content in water & many other reason & can be easily cleaned by scaling but the permanent ones cannot be cleaned by anything.