A cavity-causing mouth bacterium may journey from your teeth to your brain—helping spark Parkinson’s disease along the way. Credit: Shutterstock There is a new reason to take daily tooth brushing seriously. Researchers in South Korea have found strong evidence that bacteria from the mouth can move into the gut and influence brain cells, potentially playing a role in the development of Parkinson's disease. The study was carried out by a collaborative team led by Professor Ara Koh and doctoral