Bolo Quesada was 13 when his older brothers inspired him to get his first pair of gold grillz. “It used to be a specific type of person that had grillz,” Quesada, who is now in his early 30s, says. “It went from the dope boys to now the average kid getting them.” Grillz, the dental jewelry typically made of gold and encrusted with diamonds or other gems, has exploded in popularity. And grillz shops have popped up across the country,…