The Hidden Science of Your Toothbrush: How Often Should You Replace It—and Why It Matters More Than You Think
The bristles on your toothbrush are a battlefield. Every swipe across your teeth is a skirmish against plaque, a microscopic fortress of bacteria that clings to enamel like ivy to stone. Yet, most people treat their toothbrush as an eternal companion—until the bristles fray, the handle cracks, or the minty scent fades into a ghost […]