Our strongest formula for the deepest stains. Teeth whitening gel refill pack includes (3x) 5mL gel syringes for a total of 15mL. Each syringe contains 10 whitening treatments (based on recommended .5mL per use) 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 .5mL 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. | Gel is made in the USA which it is safe and highly effective. The gel is gluten-free, kosher and cruelty-free using high-quality ingredients.