“Jet planes, islands, tigers on a gold leash.
We don't care, we aren't caught up in your love affair”

Lorde – Royals Lyrics on LyricsMode
She's saying that if you have a private jets and islands, crazy pets with expensive things, everyone's obsessed with the champagne, parties, cool cars, diamonds on your watch, private jets and islands, tigers with golden leashes. No one cares that you're rich and famous, or who you're currently dating.
Other people can enjoy their million dollar life with gold leashes, private planes, and private islands while they like their life with cadillacs just in their dreams and that's good enough for them. Gold teeth are disgusting because they're probably just getting them because their teeth are rotton and they probably have millions of cavities if their doing that and they can't settle for just aplain stainless steel cap. I'm a dentist and I can tell you that a stainless steel one is just as good and probably better. They probably do have millions of cavities and don't care for just a silver colored.