PALM SPRINGS — For the past few months, anyone willing to sacrifice hygiene for a discount on gold teeth caps could stroll into a nondescript shop on Lake Worth Road, have their grill fitted and be on their way with a mouth full of bling-bling. Some customers got shiny new golden "grills" and led their friends to the business. They were the lucky ones. Other clients of the unlicensed dental shop fronting as a custom jewelry shop in the 3200 block of Lake Worth Road ended up with painful, infected mouths. The amateur dentists, detectives say, cast grills using filthy...