Believe it or not, sipping through a straw is worse. A lot of people do it so they won’t stain their teeth. But dermatologist Carolyn Jacob says, the coffee is going to swirl around your teeth anyway. But the straw can cause lip wrinkles. That’s because repetitive movements, like pursing your mouth, break down collagen – which is what keeps skin firm. So drink from the cup instead – wait 30 minutes for your tooth enamel to re-harden, and then brush or chew sugarless gum to prevent stains.