Do you have an hour? This procedure offers a fast way to get bright teeth at your dentist's office. A professional procedure like teeth whitening can only be done with your dentist, and it uses a light-activated teeth whitening system to achieve maximum results in the least amount of time. This whitening gel contains only 15% hydrogen peroxide, so you experience very little or no temporary tooth sensitivity. Teeth whitening is gentle. There's no laser and no heat. It's just gel and soothing light. All you do is sit back, relax, and watch TV or listen to music for an hour.