The delivery was very quick. I have the Whitestrips applied only 4 times and leave it at that. Have after 4 application, my color is achieved I wanted. I am a very heavy smoker, so I got the strips 1 hour before bedtime used, then rinsed my teeth with water and Elmex jelly made it and after 2 min ausgespühlt again. I must say I am very surprised how fast it went, and I had or have any gum problems or toothache. I would recommend this product only.