Do "Crest Whitestrips classic" really work?

Does Crest 3D White Whitestrips Professional Effects work in 6 USE'S?

• Well I just bought these whitestrips and i used them yesterday and today for half an hour each I bought them off of ebay but it only came with 6... Do you think that they will work in 6 uses? ALSO since i only have 6 should i wear them for longer? (They are enamel safe)

• Answer:

  I use these! Yes, they will work. They won't whiten as much as if you used all that you're supposed to, but even the box says you will see results after three uses. I think they work really well. I don't think it is good to keep them on for longer than thirty minutes at a time. Although, they say it is "enamel safe" it still isn't 100% great for your teeth. If you use them longer than a thirty minute period your teeth will hurt.