Alexis Meyers is a happy 14-year-old girl. She smiles easily. But when she does, she often gets teased. “I get made fun of a lot,” she said. “Saying I have rabbit teeth and those kinds of names.”While she knows where the taunts come from — “My teeth aren't straight, and I have this huge overbite” — she fears that people just see her mouth without truly seeing her.“I've been wanting braces for five years,” she said. “I desperately need them.”So when her grandmother found a promotion online for Smiles For a Lifetime, an organization offering free orthodontic work, Alexis rushed …