Our extra strength 44% carbamide peroxide teeth whitening gel is for those who are looking for a whitening boost from our standard 35% carbamide peroxide gel. The 44% gel uses a stronger formula to wipe away deep tooth stains or stubborn stains that won’t go away. The 44% carbamide peroxide is our strongest formula for the deepest stains. Teeth whitening gel refills include (3x) 5mL teeth whitening gel syringes for a total of 15mL. Each syringe contains 10 whitening treatments for a total of 30+ treatments in this refill pack. Whitening gel contains dental-grade 44% carbamide peroxide in mint-flavor. Removes years of stains from coffee, wine, soda, tea, smoking and more. This is a stronger bleaching gel and is not recommended for those with known sensitivity issues. To use bleaching gel, squeeze 1 use of gel into a mouth tray (not included) and wear for 30 minutes. Alternatively, you may squeeze the gel into a small bowl or dish and paint onto your teeth to whiten. Repeat this process for 7-10 days until desired results are achieved. If used as directed, most customers see results in as little as 1 treatment. The gel is safe for enamel as well as caps, crowns and veneers. All of our whitening gel is proudly made in USA for safety and efficacy.