Have ordered these Whitestrips and they have just told me throughout 14 days. When I wore it was kind uncomfortable ... the taste is not the best and the Whitestrips dissolve some of the teeth, because the spoke, so I eg: handkerchiefs on Strips clamped and it was better. After only 4 days it noticed several of my friends and they asked me what I'm doing because to erziellen such white teeth. So: the ecklige taste was not in vain!