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 and not harmful. If significant tooth sensitivity or gum discomfort develops, try stopping usage for 2-3 days, then resume usage. If the problem persists discontinue usage. Keep out of reach of young children. Not intended for use in children under the age of 18. Do not swallow plastic strip. Crest 3DWhitestrips is not a substitute for regular dental care. Visit your dentist regularly. Avoid eye contact. Rinse eyes thoroughly with water if gel comes in contact with them. Handle strips with dry hands. Gel that comes into contact with the skin can cause temporary skin irritation and/or whitening. Wash hands with soap and water after use. Avoid contact of gel with cloth, leather, or fabric. Do not eat, smoke, sleep, or drink (with the exception of water) during 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 3DWhitestrips are designed to hold well to teeth. Do not use on loose teeth, restorations, or braces. Crest 3DWhitestrips will only whiten natural teeth. The strips will not whiten caps, crowns, veneers, fillings or dentures.