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With winter upon us, the common cold shows us why it’s aptly named. Rhinoviruses, responsible for many episodes of congestion, coughs, and sore throats, transmit through the population during every season. Research suggests that this virus replicates better at a temperature a few degrees below the body’s core temperature. People tend to share closer spaces inside during colder weather, making virus transmission easier in these cozy areas.

Many people are surprised to learn that tooth decay is the next most common disease afflicting the population. The bacteria that cause cavities thrive in the mouth, but babies aren’t born with them. They’re an infection that’s often passed from mothers or caregivers once teeth start to appear. Since 92% of adults report at least one cavity, dental fillings are familiar to just about everyone.