teeth tatoos

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today totoos r really in.tatoos on hands,arms,backs,nails,face etc etc.sometimes i have read that these tatoos r harmful even.but today i came to know about TEETH TATOOS.Not able to understand how one can add something artificial in the mouth?pls can anyone explain.isnt it so durty?then how wil we brush our teeth?i am attaching an image of a teeth tatoo.