Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Seems to work, but not for long

I bought this product as an extra weapon in my arsenal against periodontal disease.It definately seemed to improve my gum health (based on bleeding reduction) but like others have found it stopped charging up after about a month of use.I properly conditioned the battery per the instructions, and it worked OK for about 5 charges, but on the 6th it did not turn on at all.It also took an average of 2-3 fills per use, but this was not a big deal for me.I'd avoid this and go for a plugged in version, which is what I replaced it with. Aside from the battery issue, its much easier to use the plugged in one as the handle is less bulky, and the mechnism to turn the nozzle to keep it aligned with your gums is better.