Crest 3D Whitestrips Sensitive + LED Light Dental Whitening Kit 1 Light / 14 Treatments Crest 3DWhitestrips Sensitive + LED Light is formulated to be gentle on teeth that may be sensitive to whitening. The specially designed formula along with our LED Accelerator Light gently removes over 20 years of tough stains. Using the same enamel safe whitening ingredient as dentists, you can get noticeably whiter teeth, 100% guaranteed. Plus, a comfortable no slip grip helps the whitening strips stay put, so you can talk and drink water while whitening your teeth. Simply apply for 30 minutes a day (plus 5 minutes for the LED Accelerator Light) for 14 days. This pack includes 28 teeth whitening strips, 14 for your top teeth and 14 for your bottom teeth, and an LED Accelerator Light, to be used over the course of 14 days.