Dwayne Johnson is showing his fans his toothy younger days. The “Jumanji” star shared a fun throwback snap from his childhood where he’s showing off his buck teeth and teased his pre-Hollywood looks. “Throwback to 7-years-old in Hawaii and just drippin’ cool with my buck teeth, aloha shirt, and WTF is going on with my afro matted down on one side? No way this stud doesn’t grow up to become Sexiest Man Alive,” The Rock joked