Review on 🦷 Professional Bright White Smiles Teeth Whitening Kit with 35% Carbamide Peroxide Gel, Home Refill System for Whiter Results, Includes 5X 5cc/ml Syringes by Michael Dunn

It's a liquid, not a gel - it won't stay in bleach baths or come in contact with teeth. The solution is sharp enough to induce constant salivation. So when using them, always have a saliva cup handy. The syringe also sticks, so when you press on it it sticks and then suddenly gives out, expelling a quarter to a third of the bleach solution at high speed, which then bounces off the bleach tray and back over your clothes. I used one syringe and threw away the rest.