The Joker’s metrosexual-via-Hot-Topic look in Suicide Squad has been controversial since the very first picture was released, and director David Ayer has finally shared a bit of the logic behind the facial tattoos and dental work.
"This is sort of my personal thing and maybe less about a larger connection," Ayer told Empire. "But Joker killed Robin and Batman basically smashes his teeth out and locks him up in Arkham Asylum. It’s in the asylum where Joker would have done the ‘damaged’ tattoo as a message to Batman saying, 'You’ve damaged me. I was so beautiful before and now you’ve destroyed my face.' That’s where the grill comes from."
This lines up with the Robin suit we see in Batman v Superman and Bruce Wayne’s crack about "clowns" from that movie. It’s still a little jarring to think about the Joker looking at his wreckage of a face and deciding to go with a tattoo that’s so on the nose.
So this may not be canon in the film series, but it’s still a fun detail. Still no answers on the multiple "Ha Ha Ha’s" tattooed on the Joker’s body, however.