Pay close attention! Be sure you understand the amount of gel needed for each dental whitening application because each brand will tell you something different. The common amount of gel used to bleach a single arch (either upper teeth or lower teeth) is .5ml. That means with one of our individual oversized (5ml) syringes you will get 10 whitening applications each. That means that a 3-pack of our syringes, you will get a total of 30 applications. With 3ml syringes sold by our competitors, you will only get 6 applications and a with a tiny 1.2ml syringe will give you just over 2 applications. Make sure you do not make your purchase decision based upon number of syringes, but the size of and number of syringes.