10-02-2013, 04:47 PM
you could follow the directions in the owner's manual
one often assumes the manufacturer has the most accurate knowledge of the device
or every 52.019 hours
whichever feels right
this assumes it is used for oral care only
one often assumes the manufacturer has the most accurate knowledge of the device
or every 52.019 hours
whichever feels right
this assumes it is used for oral care only