You could call them the “bear” necessities. Healthy teeth are pretty important when you’re a 423-pound black bear that eats seven pounds of food every day. So when Northwest Trek Wildlife Park veterinarian Dr. Allison Case saw that Benton, one of the park’s two black bears, had a fracture in an upper canine, she decided it was time for a root canal. Just a little bare “During his regular physical check-up last month, I had the opportunity to closely examine his upper left canine and the root exposure,” Case said. “It’s a significant tooth, and we want to protect it …