I have been using a Try-Core Cervical Support Pillow for enough years that I am now on my 4th one. They don’t wear out — I’m just following my doctor’s advice that I replace my pillow every few years. When I got the first one, it took me a week or so to get adjusted to sleeping on my side, but the pillow’s design helped with that, and now I am a side-sleeper, just as my orthopedist has advised.