They are the 'professional effects' and you use them once a day for half an hour. Inside the pouch you will find the strips. The longer one is for your top teeth and the shorter for the bottom. All you do is peel them from the backing and stick them on your teeth, folding any excess to the back of the teeth. Wait for 30 minutes and then taken them off and brush your teeth. Simple as that.
It is recommended that you use the strips for 20 days for best results. I have used them for 10 days and can see a huge improvement. I am thinking about buying another 5 day supply as I don't think i need to do 10 more. I didn't experience any sensitivity with my teeth or gums which I thought I might do. It suggests that if you do to just take a break from the strips for a day or two.
I think the best place to purchase the strips from is ebay. There are many sellers on there and I would check the sellers feedback before buying to make sure they are not fake. Most of the sellers send the strips without a box or instructions to save on postage costs, but instructions can be found online should you require them.
Thats all I have to say for now. I wish I had taken a photo of my teeth before I started so I could show you the results but unfortunately I didn't. Let me know if you have had a good or bad experience with crest whitestrips.
Charley Rose x