On 25/10/2017 16:44, Andrew Gabriel wrote:

Assuming the toothbrush is designed for 120-240V supply, you
should always plug it into the 120V shaver socket (with an
adaptor of necessary) when using an isolating socket shaver
socket.


No longer a safe assumption given the OP referred to a "brawn family
type". Braun stopped providing dual voltage chargers with their Oral-B
toothbrushes several years ago.

--
Robin
reply-to address is (intended to be) valid