Teeth can be covered in plaque or calculus that is caused by tobacco, coffee, tea or red wine. Usually removing calculus and polishing is enough to remove most of those imperfections. In some bad scenarios, the stain can incrust itself in the enamel or dentin. This gives the impression of having yellow teeth. Teeth whitening will be the best solution to give your teeth their natural look back. This safe process uses hydrogen peroxide (or carbamide peroxide) that will be applied on your teeth using a specific tool. A mold that fits your teeth perfectly is used to apply the whitening gel. The optimal treatment lasts around two weeks. Once the treatment is completed, minor touch-ups can be done since the mold is reusable as long as there are no major changes to your teeth.