That's just so wrong already. Regular toothbrushes are absolute trash compared to sonics, every dentist will tell you that.
> don't use mouthwash (even a fluoride one) straight after brushing your teeth or it'll wash away the concentrated fluoride in the toothpaste left on your teeth
So in a nutshell, don't use it because it'll wash away the flouride... that you've already rinsed out. Yeah not much of a minus there.