needs to be used twice a day for two weeks [SEP] the pen is super convenient easy to carry and conceal you push the base to get the gel started once you start to feel resistance you know it is at the top when using it ensure your teeth are dry enough to hold the gel i like that it is no rinse needed just wait minutes after applying to eat or drink while the idea is great the results were minimal to see max results the gel needs to be applied twice a day for two weeks at that rate you would be better going a different route