British plumber Barmy Baz Franks, 29, got a dentist to use ultrafine brushes and stencils to paint images of the smiling royals. The temporary ivory art – known as “gnasher tats” – will last roughly three months, depending on how much Barmy Baz Franks brushes. “I’ve done some unusual dental cosmetics in my time, but this was certainly one of the strangest,” said the dentist, Dr. Neil Gerrard, in an interview with Small World News Service.