Keep out of reach of young children. Not intended for use in children under the age of 18. Do not swallow plastic strip. Avoid contact of gel with eyes, cloth, leather, or fabric. Gel that comes into contact with the skin can cause temporary skin irritation and/or whitening. Wash hands after use. Do not eat, smoke, sleep, or drink (with the exception of water) during use. Tooth Sensitivity & Gum Discomfort: with all whitening products you may experience tooth sensitivity and/or gum discomfort. These effects are generally mild. These effects are temporary, not harmful and will go away once you discontinue use. IF YOU ARE IN NEED OF DENTAL WORK, HAVE DENTAL WORK, OR HAVE STAINING FROM MEDICATION, ASK YOUR DENTIST IF WHITENING IS APPROPRIATE. Crest 3D Whitestrips are designed to hold well to teeth. Do not use on loose teeth, restorations, or braces. Crest 3D Whitestrips will only whiten natural teeth. The strips will not whiten caps, crowns, veneers, fillings or dentures.