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Contains 4 syringes of Opalescence PF 20% carbamide peroxide based gels. Delicious melon flavored. Strong whitening for healthy non sensitive teeth. Nothing freshens up your appearance like a whiter smile. Opalescence is the first ADA accepted, syringe delivered, take-home bleaching gel. The patented formula has sticky, adhesive properties, which produce results in days rather than weeks! Those glorified toothpastes at the grocery store just can't give you the whitest possible smile, only your dentist can. Opalescence tooth whitening system safely bleaches your teeth to lighten discoloration caused by food, coffee, tobacco, aging and other sources. Opalescence gives you beautiful overnight results. -Fast, safe and effective -Delicious flavors (mint, melon) - Great taste; minimal salivary flow. -Patented, sticky, and highly viscous formula stays in tray and on teeth where it belongs! -Significant water in formula minimizes tooth dehydration -Wear as little as 30 minutes per day! -Stays active for 8-10 hours for night time bleaching The whitening gel is a thick solution, which is applied by the patient at home using a clear and inconspicuous custom fitted tray. The unique tray is used to minimize tray contact and peroxide gel exposure to soft tissues. The Opalescence PF sticky formula does not leach from the tray as did former tooth whitening preparations. The delicious melon flavored gel is worn overnight, while you sleep for ultimate performance and maximum convenience. The patented formula bleaches in as little as 30 minutes in 1-3 daily treatments or for 1-6 hours daytime (if worn overnight, gel will stay active for 8-10 hours). The active ingredient in Opalescence, carbamide peroxide, has been recognized by FDA for many years as an oral antiseptic and is now used for its superior tooth whitening properties. Opalescence is available in a variety of carbamide peroxide concentrations to whiten even the most difficult stains.