I was surprised at this amazing toothbrush. My MS(medium soft) brushes completely changed the brushing time into more cmfortable one. You can also recognise that this product is useful for not only just brushing your teeth but also rubbing gums to prevent periodontal desease as long as you choose suitable one,though it depends on you whether which type should be chosen.
This is often said that the effective life span is almost one month, but my two months toothbrush still looks as new as what it was. I cannot find any negatives about this unless this is sold only through the internet.