i counted the days i was without it [SEP] my original sonicare died after about years my wife spent bucks on it and needless to say i was not happy to see it go you would think a toothbrush would last pretty much forever anyway i replaced it with this much cheaper model and am very pleased so far in addition to being a lot less expensive it has a much simplified design which should last longer and has a user replaceable batteryon the negative side it seems to chew through batteries in fact i actually reported the first one amazon shipped as defective as it stopped working after days turns out the batteries i swapped were dead too and there was nothing wrong with the toothbrush after all my bad the fresh batteries i installed only lasted maybe weeks or so i am going to use rechargeables from now on but just be forewarned that this thing gobbles batteriesbut in terms of the operation of the toothbrush i love it in the short time i had to use a regular toothbrush waiting for this to arrive i felt like i had trench mouth no matter how long or how vigorously i would brush my teeth just never felt clean and by if felt like i had not brushed in days the commercial is a cliche but it is true sonicare makes you feel like you just walked out of the dentist office