I was cautious at first, but read all the wonderful reviews and decided to try them for myself and very glad that I did. My dentist wanted $600 for a single night guard and I was able to get a top and bottom and a whitening kit for $160. Customer service was very helpful and friendly. I had to redo the bottom impression which was a little too narrow and they told me just what to do to fix it. I sent them off and a couple of weeks later they came in the mail. They all fit really well and can't wait to try the teeth whitener! Very happy with everything!