just brush my teeth before you leave me

The story:

My sister and I sat in the back row bench seat of
the van during one of our many trips 'up north'
from Detroit to Pigeon. In 1981, I was 9 and she
10. My mother always thought she was being
tortured having to listen to my fathers choice of
music and this song being one of those moments.
SO...my sister and I thought we would belt it out
as loudly as we could as to ad to the torture. But
when my sister over heard me belting out "just
brush my teeth before you leave me", I was busted.
So busted that today she taunts me with those
'misheard' lyrics.
It made so much sense at 9, who wouldn't want to
have clean teeth before leaving? And someone to do
it for you?
For now, while before leaving from an out-of-state
visit, I tell her I'll just touch her cheek.