have whiter teeth

I told my Mom that I was tired of having yellow-ish teeth (she claims they are really not yellow, but they still make me self-conscious) and she gave me some Crest Whitestrips. However, I found that they were fairly easy to put on the top teeth but endlessly difficult to put on the bottom. When I tried to stick them on my bottom teeth, they got stuck on my fingers and the sides of my mouth. I didn’t mind the sticky gunk all over my teeth (because it was, after all, all about the result) but I couldn’t manage to get the whitestrip on my bottom teeth! It was highly aggrivating, so I’m currently trying to find out about something else that will help.