Lyric discussion by renegadeLD 

obviousssly "white teeth" is also alluded to in 400 lux, a song about heroin. "white teeth teens"--the majority of teenagers that look the same. They abide by their parents, authoritative figures, and never think outside the box. They just do what they're supposed to, and everything is "supposed to work out for them." While those kids who may deviate from the norm, try drugs, think for themselves, or just exist unconventionally, are generally told that they wont amount to anything, and they will live very forgettable and unremarkable lives.

If you could just picture Lorde, sitting under an overpass with her friends doing heroin, and ironically laughing at all the "white teeth teens" who listened and she didn't. She took the "unconventional route" and it paid off. This is essentially the entire meaning of the song. Irony about how she thought outside the box, did her own thing, was not like the "white teeth teens" and succeeded. "White teeth teens are out" meaning that, being a nodding sycophant is no longer relevant or needed for success.

"And everything works out so good I wear the robe like no one could" Speaks for itself.

also... "we got the glow in our mouths" = heroin use..teeth turn yellow

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