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Posts tagged kissing

September 8, 2015


illustration of kissing couple

Why Do People Kiss?  

Smooching feels good, of course, but couples first started swapping saliva as a way to test out genetic compatibility.

September 27, 2003


Bacteria that Fight Tooth Decay

Most tooth decay is caused by a strain of bacteria called Streptococcus mutans. It consumes sugar on the surface of the teeth and converts it into lactic acid, which is what eats away tooth enamel, causing decay.

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