I used to buy this model and it worked. Mine is the newest, I don't know if it's broken or if the quality has gone down.* Like all battery powered toothbrushes, it only works with new batteries. (You should replace the batteries well before they run out.) However, after a few battery changes, the motor is pretty drained. You change the battery every two weeks at first, but after two or three changes, it stops brushing your teeth with batteries.* The motor is extremely weak. It cannot withstand the pressure of your cheek when brushing your teeth.* The power button is weaker. As you clean the sides, the engine will slow down and in the process drop power, so it won't gain momentum after you finish the sides. You have to press the power button several times during the cleaning, especially if your battery is already 5 or 6 days old. I usually do this right after cleaning. My enzymatic mouthwash cleans my teeth much better.
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