1. Teeth Whitening Gels is absolutely safe for your sensitive teeth and gums. Most people can see noticeable whitening results after the first whitening process. 2. Our teeth whitening gel is 100% safe for at-home whitening. It is best to use 15-30 minutes to get better result. 3. Teeth Whitening Gels can quickly and safely remove all cigarette, coffee and tea stains that have been formed through the years, and help you find your whitening smile easily. 4. Professional grade tooth whitening gel effectively whitens your teeth, the same technique you'll find at the dentist, but from the comfort and convenience of your home. 5. 15-30 minutes per time each day and keep using for 10 days.