Your tongue is covered in tiny bumps called papillae. Inside many of them sit taste buds, little clusters of cells that sense chemicals in food. When you bite an apple or sip soup, dissolved bits touch those cells. The cells send messages along nerves toward the brain. You have thousands of taste buds, not just on the tongue but also on the roof of your mouth and throat. They replace themselves every couple of weeks, like a slow refresh.
⚡ DID YOU KNOW?
Taste buds live about 10 to 14 days before new ones grow. Burning hot pizza can sting them, but they usually heal quickly.