Researchers have discovered ancient dental fillings in northern Italy, the world's oldest. The fillings were found inside a pair of 13,000-year-old front teeth. They were made of bitumen, a semi-solid form of petroleum.
Have a cavity? Ask your dentist about filling it with a mixture of nanoparticles including silica and zirconia. These white fillings (known as nano-composite resins) resemble teeth better than their metal alternatives and are less likely to come loose or fracture teeth. This is just the beginning argue Brazilian scientists in a review of ‘nanodentistry’.