i wanted to love this [SEP] i really wanted to love this product i have tender gums and oh my goodness these brushes are a dream it is like brushing with a sponge and a texture some may need to get used to but my gums do not hurt anymore and actually feel cleaner maybe get that plaque build up off the front main teeth but there are other products for that the issue i have is that the brush spreads open i kid you not i used this brush as soft and gentle as i could as to not push and spread the brush all crazy that did not work the more i use it no matter with pressure or not the brush is spreading it comes all small and straight and neat and as you use it it spreads out and looks like it is going flat it is weird i assume it is how i use i dry it every time i use it as well i thought maybe not drying all the way would have water built up you cannot see inside the brush like a normal tooth brush we have used all four and all four spread the brush and dont keep same shape as when you first brought it