What if a common household item most of us have in our medicine cabinet could kill the coronavirus? That's the exact question we pondered when we saw, earlier this week, a new study by researchers from Cardiff University in the UK that analyzed the ability of mouthwash the kill the coronavirus. Taken at face value, this is great news, but according to doctors we spoke to, it's probably too good to be true. Read on for everything you need to know about mouthwash and COVID-19—and why you probably shouldn't worry about stocking up on Listerine right now.