Just wondering that the best at home teeth whitening kits there are?

Strips: My new favorite is sheer white self administered strips. Get teeth cleaned first for maximum effect.

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.