This replacement brushes are absolutely well in function and durability. Especially since they are going to have 2 Pack at a solid price. A brush holding under normal use about 4 - 6 months. That's not all lace and sonic toothbrushes that. The function and durability of the basic unit is outstanding. General tip for all elec. Toothbrushes: Do not constantly connected to the charger, and connect the charger only when loading the grid. This saves battery power and extends the lifetime enormously. A load all 4 - 5 Days enough perfectly and saves battery power even. This means that a replacement only after min. 3-fold run time is required. The manufacturers of course do not like to hear. Same Tip applies to all battery-powered devices (such as DECT phones, etc.). Only if necessary to the charging station!
