bzzzzzzzzzzzzz requires maintenance [SEP] i really like being able to have my teeth this clean when i am on the road camping etc it seems to work really wellwhen it worksi have been through three of these i like them enough to purchase another but have some complaints about their durabilitymy first two units refused to operate after about months after the second one decided to stop working i decided to take it apart what i found was pretty gross cr p was growing inside and seemed to be wellit was not an attractive habitat inside the toothbrushnot for me anywaywith my most recent battery operated toothbrush i have decided to remove the brush head right word and shake all the water out every time i use it this one has been going strong with every day use for over monthsit would be nice if the manufacturer gave instructions as to how to prolong the life of your purchase but then again they probably would not make as many salesthey have sold me three in the course of a year