Well if you dont smile, you dont need to care about what your teeth look like, hence no need to waste energy brushing. Hence I never brush my teeth.
You GUESS? So you don't have data...I'm guessing they finally figured their disgusting teeth nauseate most people?
Most UK guys don't smile. For pictures or anything else.
Beautiful teeth are a matter of personal responsibility, pride, and dignity. There is NO excuse for looking like you have a mouthful of sh!t.
Even rich idiots have bad teeth.
Better to have cavities in the teeth than cavities in the intellect.
Fortunately I'm good-looking AND smart, so I don't have to make the choice...I'd rather be good looking and brain dead, than ugly and smart.