they just do not work [SEP] i have used dentrust surround toothbrushes along with collis curve toothbrushes for years and years and my teeth stay squeaky clean in a rush my own fault i bought surround toothbrushes by mistake they just do not work i carefully ordered dentrust brushes again and now feel clean i honestly do not understand all the great reviews for these toothbrushes i gave one of these to my husband and he hated it i gave two more away to my daughter and her husband and they threw them out if you try these and try dentrust you will feel the huge difference