Brushing teeth quite specifically

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Hey,

I am looking for a movie where there's this specific scene where the narrator tells us the protagonist brushes his teeth individually precisely X times (I don't remember how many times, but he does every one of them exactly that amount of times).

A bit later he brushes his teeth quite wildly. I have no clue where to look or what movie it could be, I really need your help!

I thought it was a 'recent' movie, somewhere in the '00s or '10s.



Great! Thanks a lot.