I have been using tooth whitening products for years. I've tried lots of different kinds of products and the white strips are definitely preferable to other forms. It is much easier to put a strip on your teeth than it is to paint or rub on other whitening products. The strips are much less cumbersome than the whitening trays. Whitening strips have also come a long way in the last few years. They used to slip around a lot, now they've improved them so they really stay put. I've used a few different brands of white strips, both store brands and national brands. My favorite would have to be Crest's newest white strips. They work quickly and are easy to put on. I know that they're effective because my dentist noticed that I was using a whitening product without me telling her first. She had given me a sample in the bag of dental goodies that she gives a way after a cleaning. I liked it so I went and purchased more. Effectiveness I definitely think white strips are the best way to whiten teeth outside of having it done in a dental office. Convenience White strips are very convenient. I put them on before I get in the shower and they're ready to come off when I'm don't getting ready. Minimal Side Effects I have never had any ill effects from using white strips. I have sensitive teeth and they have never caused me any issues.