Please tell me, are there any products i can buy that whiten teeth overnight?

Teeth whitening: Over the counter whitening strips can be helpful, though they only cover the front 6 teeth and some people find them cumbersome. Custom made trays made by a dentist are more effective because they use a higher concentration of whitening solution than what is available over the counter. Avoid anything that requires a rinse with an acid "pre conditioner"-it will erode the enamel, make teeth painful.