Healthy human teeth are usually a slightly yellowish shade of off-white, but they can develop unsightly and distracting stains and discoloration due to factors like chemical exposure, certain medications, and age. Thankfully, your dentist can provide you with a professional-grade take-home teeth whitening kit that can deliver magnificent results in about two weeks. Here’s a quick guide to how this process works and when is the best time to start whitening your teeth before a special event.