System for adapting {TAIL ~ the resonant operation} of {HEAD ~ a personal care appliance} during the lifetime thereof 
System for adapting { TAIL ~ the resonant operation } of { HEAD ~ a personal care appliance } during the lifetime thereof
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH