What causes cavities? The TED-Ed animation watched 7.6 million times, explained
TED-Ed's animation "What causes cavities?", presented by Mel Rosenberg, has more than 7.6 million views on the TED-Ed site. It starts with archaeology — human remains from around 15,000 years ago already show cavities — then zooms into the tooth surface to show how bacteria in plaque turn sugar from food into acid that slowly dissolves the tooth. The World Health Organization says untreated decay in permanent teeth is the most common health condition worldwide.
TED-Ed