This is a toothbrush with a change of "bristles". Stuck comfortable, but the bristles rapidly "loses its shape," and it lacks long. From pluses: schёtina soft, it does not injure the gums, for my middle tooth sensitivity. But I forgot about it immediately once met with "ionized" brush :) It is unlikely that I will buy again, although I must admit that the idea with replaceable bristles good. By the way, replace it with a very, very easy (interchangeable eyelets are included) from the back side brushes need to squeeze an old bristle by clicking on the circle (press any convenient improvised pieces), and insert a new, properly securing it.