What should I do to remove yellow stains from my teeth?

Hi,

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Yellowish discoloration of the tooth has multiple causes. In your case, as the stains are not going with cleaning and scaling, it can be due to any one of the Fluoride in water causing problems during tooth formation. Injury to the tooth during childhood. Any systemic problems. Some antibiotics also cause yellow staining. I would suggest you go for ceramic veneers that are tooth colored covering or cap for the front tooth (zirconia or all ceramic). If possible do post the picture of your tooth, so that I have a better understanding of your problem.