Wife needed an urgent root canal and was able to hold it off for 6 months. My live-in helper had super sensitive teeth, couldn't eat or drink anything cold.... after a few weeks, I guess enough remineralization had occurred and she's at normal tolerance now. I feel like my gums are stronger, though if there's no issue, I only end up doing it once every couple of months. One of my kids had noticeable bad breath and I told her to try it... and it cleared up with 2 treatments. So wide range of positive effects.