horrible flavor non existent results [SEP] being a tea and coffee drinker my teeth have a tendency to stain from time to time i have used otc whitening products in the past with a lot of success i was originally looking at the colgate pen but saw very mixed reviews and decided to go with this onepackaging top notch the colors construction and branding are all on point however that is where for me the good news endsto start the pen be prepared to click times to get the first bit of gel to come out after that sometimes just opening the pen is enough to cause it to ooze other times you are going to be clicking times to get it to dispense the gelto prepare the teeth i use a kleenex to wipe the teeth down so they are dry i apply a generous coating of the gel to all the teeth in front top and bottom once applied i leave the mouth open and teeth exposed to allow the coating to dry suggested was seconds i went up to minutes with no difference once you close your mouth the product immediately starts foaming the flavor is not good i know this is subjective but it is like dropping cinnamon red hots into vanilla coke letting it set until flat and then watering down to almost no flavor after days there has been no change in the color of my teeth i have used a color guide from my dentist to follow the process and i have stayed right around a horrible taste ineffective whitening more than yeah not for me