3. The common cold is the most widespread illness on Earth.
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It seems that there is no person who’s immune to catching a cold in cold weather. But there is a more widespread illness that doesn’t depend on weather conditions. We are talking about cavities. They seem harmless, but they can affect one’s health greatly.
According to an extensive research project supervised by professor W. Marcenes from the Queen Mary University of London, it’s cavities that can become the main headache of modern society. It turns out that 2.5 billion adults and 621 million kids in the world face this issue and it’s a good reason for brushing teeth and visiting the dentist more regularly.