This standard professional whitening pack includes 20 whitening gel 3ml syringe dispensers in maximum strength 44% Carbamide Peroxide. High viscosity gel formula provides maximum adhesion. This is crucial so that whitening gel remains suspended on tooth surfaces. Many thin and watery whitening gels “run off” teeth during the whitening process, which compromises a uniform and consistent bleaching of tooth stains and discolorations. The 44% gel is the maximum concentration available. It has potential for more tooth sensitivity and/or gum irritation than milder whitening gels. Only a VERY small amount of gel should be applied to your dental tray. Whitening gel will expand once activated and provide tooth surface coverage. What is Carbamide Peroxide? Carbamide Peroxide is the primary active ingredient or bleaching agent in the professional whitening gel. It is essentially a variation of Hydrogen Peroxide developed especially for dental whitening. Whitening gel quickly and safely removes stubborn stains due to coffee, tobacco, red wine, tea, foods, yellowing from age and more. Most people see noticeable whitening results after the first treatment. Get the radiant smile you've been wanting without an expensive trip to the dentist. Your satisfaction is unconditionally guaranteed. * Please note that the 44% Carbamide Peroxide Gel is the highest concentration available and a very strong formula that may not be tolerable for all users. The most common issue is irritation from the strong whitening gel remaining suspended on gums. Cautionary information regarding proper use is provided with each order. Please review to ensure best whitening results.