Bests & Worsts Reviews from Amazon

First, the system also needs access to your phone camera positioned in front of your face while brushing. This is a big hassle. On top of that, the system is very inaccurate. Many times, when I was brushing my left side, the system detected it as the right side. The biggest flaw IMO is that the system does not even try to find out whether we are brushing the inner side or the outer side of a zone (e.g. upper left). Many people miss the inner sides.