Ewww... Tooth Decay and Coughing Art

Plaque builds up on teeth from communities of bacteria and other microbes that form a slimy biofilm over the surface. Free swimming bacteria can migrate to other teeth, and quickly start new colonies by feeding on left over food bits.
What causes a cough? How can we make it stop? Irritants like viral particles are usually swept away by cilia in the throat. Some make it past the outer defenses though and penetrate the throats' cells, leading to inflammation and coughing. The details, however, are still largely unknown and being studied.  

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