We have optimized many aspects of the Blizzident Brush 3.0. It is smaller and therefore totally easy to use for everyone. And we have further optimized the algorithms and precision for bristle placements, meaning even more cleaning with less teeth movement. This leads to stunning cleaning performance, and extremely easy usage. Additionally the Brush 4.0 lasts much longer and needs less cleaning than the previous models (in the photo above we are showing an already used brush, not a brand-new one). And we are able to design/manufacture these very fast now.