1. What is PAP? PAP ingredients are safe for sensitive teeth:. A non-peroxide whitener that has been cically proven to be as effective as hydrogen peroxide in whitening teeth. 2. What is the difference between PAP and CP? The difference between the two is that when peroxides work, they release free radicals that can damage your teeth and gum tissue. PAP does not release free radicals when oxidising stains, which makes it safer for you to use to whiten your teeth. 3. Why choose smile products? Fast results and more effective. smile PAP teeth whitening gel makes your teeth whitening experience super fast, taking only 10 minutes a day and helping to remove stains from food, coffee, wine, soda, smoking and more. 4. How often do I use the product? It only needs to be used once a day. Most people will notice a 2 shade difference after their first teeth whitening treatment with our product. This may take up to a week to be fully satisfied. Product packaging update iteration, gel quality is same