Docs can you explain, is there a good teeth whitening product sold in supermarkets?

Whitestrips : Crest whitestrips !.. The chemical are safe and effective, but you must be dedicated to its proper use for several weeks ..

Bleaching teeth: Crest white strips can work, though they only cover the front 6 teeth, so if there is a big color change, it may be very noticeable compared to the back teeth. Avoid using any product that requires a "pre rinse" as this is usually acidic and can destroy tooth structure as well as make them more sensitive. A kit custom made by a dentist is the most effective method.

Teeth whitening: You can use over the counter or supper market products like white-strips. However, they are not so effective and/or stable. OTC bleach and whitening tooth paste could be used as a supplement only. A professional teeth whitening without laser, followed by home whitening system with custom trays for the long term effect. You will be very happy with the results.