The dentist tells us to floss, brush, avoid certain food and drinks ... but what actually matters when it comes to having healthy teeth? We're drilling into the science on all of it. Plus, we go undercover to find out how many dentists are trying to upsell you when you go in for a checkup. We talk to epidemiologist and dentist Professor Philippe Hujoel, dentist Dr. Alisha Virmani, and economist Dr....

When it comes to keeping our skin looking younger, what works? Retinol, hyaluronic acid, vitamin C? This simple question has become confused by the billion-dollar skin-care industry, which floods us with scientific-sounding claims about the chemicals they say we should put on our face. We find out the real science on what you need for healthy skin with Dr Natalia Spierings, Dr Szu Wong and Kirsten ...

Just two months before Covid-19 broke out, we made a fictional pandemic episode that was like “Contagion” but with citations. And we played it for Dr. Anthony Fauci. Today, we’re looking back at that episode and asking — how much of the pandemic did we predict?