First of all, a 4 star on durability because the metal core for the brashes is kind of weak. I have to be very careful not to bend it when brushing. It's easy to be bent as I don't really use a mirror and move it around in my mouth by feeling it.Other than the 4 star, this is an awesome product. It has different sizes, if you have never used one, for the first pack, you should choose this Multi pack as different colors are for different brush size. you can easily figure out what size is most useful and later on you can buy the single color pack for that size. From what I see it, flossing, brushing, water picking and in between brushes are all needed to keep dental hygiene in good shape.