I always brush mine, and have done for years without giving it much thought. That is until the other day when my 6 year old asked me what I was doing - suddenly I was all self-conscious! Odd, don't you think?!! Anyway, he's started to do it now too, and it cracks me up because it obviously tickles him but he perseveres no matter how much he squirms. It's very entertaining!!
I think it's a good habit to get into, and you're not alone mistys!!
Sparkly clean mouths of answerbank, unite...