I compared it with smart 4 (the guy has one) and I’ll say I didn’t notice the difference in the sensations of cleaning. If not for a very good discount, I would have bought the 4th version. But otherwise it's great that there is a plastic case where you can put a brush with a nozzle. The charge is enough for about 2 weeks somewhere (when cleaning 2.5-3 minutes). The application is pampering, I don’t use it at all and just brush my teeth. Charging simply shows three divisions and you can determine the degree of discharge on the brush, for example, on version 4 it just blinks when it is discharged.
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