Teeth. They're the superstars of the facial rock collection, aren't they? OK, maybe not in the conventional sense of 'cool', but they are fascinating pieces of natural engineering—mineralized crystals that serve a crucial role in our daily lives. But here's the catch: unlike the regenerative powers of skin or bones, teeth can't mend themselves. A cavity is a permanent dent in our dental history, a reminder of our vulnerability to the relentless process of decay.