This brush fits Philips Sonicare HX3120 / 09 PowerUp sonic toothbrush (2 brush heads) that I have been in use for half a year and thus am very satisfied. The advantage of this brush is the head of a normal toothbrush very similar and thus provides more plaster. Through the shaft section to get well into the interdental spaces. Hardness I order under "resources" and is very pleasant. I almost waited too long something with the replacement of the brush, because after changing her teeth felt again much cleaner than before. How frequently you change you have to try. It is certainly also depends on how often you brush your teeth to day and how much pressure is exerted. If you buy the Brush heads 8-Pack to keep costs within limits. I do not want to miss more and am willing for optimal well-kept teeth spend much.
