"Need" ?

Why do I need ARF-y photos in my world? 

1.  They're GOOD for you

 No more cavities! These photos and stories help build strong bones and teeth.*

2.  They're BAD for you

 Very bad. Quite bad. Sorry, now you're grounded.

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* Note:  Bone/tooth strengthening claims -- while highly plausible -- have not yet been independently verified outside of my own lab.