Polar Bear Examination at Point Defiance Zoo & Aquarium

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Dr. Edmund Kwan, from Tukwila, packs and contours a amalgam filling... News PhotoAnimal,Canal,Filling,Healthcare And Medicine,Horizontal,Hospital,Human Interest,Performance,Polar Bear,Tacoma,USA,Washington StatePhotographer Collection: Tribune News Service 2013 MCTDr. Edmund Kwan, from Tukwila, packs and contours a amalgam filling as he performed a root canal on Boris the Polar Bear Saturday February 23, 2013 at the Point Defiance Zoo & Aquarium's animal health care hospital in Tacoma, Washington. A team of veterinarians, technicians and staff performed a full physical exam, a root canal and some minor eye surgery on the 922 pound, 27-year-old polar bear who was rescued from a mexican circus in Puerto Rico. (Dean J. Koepfler/Tacoma News Tribune/MCT via Getty Images)