Well every day is a school day! I didnt know that.You're actually not supposed too as the toothpaste has an ingredient that coats your teeth and carries on working after you've brushed.
I learned this a couple of month ago and it is hard to get into the habit of not rinsing but I never do now!
Also brushing your teeth on camera is rotten. We'll genuinely see her having her 1/2 a tit one day.