How Long Should a Dental Crown Last? Posted in Cosmetic Dentistry, Dental Crowns Posted on September, 14 0218 by G Marlin Dental crowns are not a commodity, but rather should be properly crafted to ensure many years of use. Dr Gerald Marlin, a Washington DC and Bethesda Chevy Chase cosmetic dentist, discussed how long dental crowns should be expected to last. G Marlin