At first I used HX6731 - after a year it stopped charging. Theycomuldn’t fix it - they returned the money, bought the HX6511 (Anyway, the modes are not needed), less than a year later it suddenly starts to choke - it buzzes a lot but does not clean, it died after ~ 10 months, although the next time it was not soaked but wiped with a dry cloth. I exchanged it for a new one, not even a year has passed since it repeats the fate of its predecessor, I will soon go to get a new one :) In general, read the article: Conclusion: cleaning is no better than manual cleaning, it's all about money and trade. The only plus is that there is a timer, you will not brush your teeth all morning in your thoughts.
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