As Boris the Polar bear slept it off, head veterinarian Karen Wolf, left, works on trimming claws and taking care of paws Saturday, February 23, 2013 at Point Defiance Zoo & Aquarium in Tacoma, Washington. (Dean J. Koepfler/Tacoma News Tribune/MCT)




Sedated, Boris the bear is cared for during a physical examine on 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 27-year-old polar bear who was rescued from a mexican circus in Puerto Rico. (Dean J. Koepfler/Tacoma News Tribune/MCT)




Dr. 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)




Dr. Edmund Kwan at left, performs a root canal as Dr, Tom Sullivan removed a growth from the eye lid of Boris, a Pt. Definance Zoo & Aquarium 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)




A sleeping giant, Boris the Polar bear underwent a full physical exam Saturday, February 23, 2013 at the Point Defiance Zoo & Aquarium's animal hospital in Tacoma, Washington, as a team of veterinarians, technicians and staff also performed a root canal and some minor eye surgery on the 27-year-old polar bear. (Dean J. Koepfler/Tacoma News Tribune/MCT)




A pair of gloved hands are dwarfed by the furry paws of Boris the Polar Bear at the Point Defiance Zoo & Aquarium's animal health care hospital Saturday, February 23, 2013 in Tacoma, Washington. (Dean J. Koepfler/Tacoma News Tribune/MCT)