Good ole' masturbation.
Guy 1: "I brush my teeth 2, sometimes 3, times a day!"
Guy 2: "I never go a night without brushing my teeth."
Guy 3: "I love it when my dentist brushes my teeth, he's much better at it than I am."
Guy 4: "I haven't brushed my teeth in a while."
Guy 5: "Some guy around the corner wants to pay me to let him watch me brush my teeth."