John Mayer had some Botox done, but he's not just (trying to conjure up) another pretty face. The singer and guitarist has been on a vocal hiatus, due in large part to severe health issues that left him all but silenced. Mayer eventually connected with Dr. Steven Zeitels, a laryngeal expert who rocketed to fame when Adele thanked him at the Grammys. (Zeitels has also worked with Roger Daltrey and Steven Tyler.). After extended periods of voice rest, it became clear Zeitels' combination of surgery and Botox injections ...
