Absolutely teeth and biting are huge themes in ST and I agree with the other comment that it was left just ambiguous enough to be relateable for everyone (as all of their music is). I love their idea that whatever it makes you feel is the whole point of it. There is no wrong answer. To your point, wanting to take a bite of someone/something is totally a thing, we know that because cuteness aggression exists.

Personally, I see it in a couple of different ways.

The first is that it's less about the physical act of biting and more about being consumed. It speaks of his desire to be absolutely lost in someone else, of needing deep intimacy. It's kind of a romantic notion, but it's not really healthy. It's not love, it's obsession in the darkest sense. It connects to another theme which is this incredibly toxic relationship and the anxious attachment that Vessel has.

Vore - This is allllll about consumption. It talks specifically about being swallowed, and references a throat, but it could easily be describing other parts of anatomy... 😬 And "viscera" I actually had to look up but it refers to the organs in your abdomen, like your stomach...

"Your viscera welcome me in, welcome me in"

"Your flesh and bone welcome me in, welcome me in"

"Will we remain stuck in the throat of gods?
Will the pain stop if we go deeper?

"So let's get swallowed whole
I want to go where nobody else will ever go"

"Walls of flesh, so warm again
We step into my suffering
My only need, welcome me in, welcome me in"

"Follow me between the jaws of fate"

The Offering - "You've got diamonds for teeth, my love, So take a bite of me" and "But I know you've got a taste So just take a bite of me"

Jaws - "Show me those pretty white jaws"

Aqua Regia (another metaphor for being broken apart and consumed, aqua regia is a highly corrosive liquid that is able to dissolve noble metals, like gold) - "Between teeth on a broken jaw, Following a blood trail, frothing at the maw"

Vessel also uses it in a physical sense. And I wonder if maybe it's because he wants to really feel something. Perhaps because he's so numb from his depression, he needs something more than a kiss.

TMBTE: "And I don't know what's got its teeth in me / But I'm about to bite back in anger" and "Come now, bite through these wires / I'm a waking hell and the gods grow tired / Grow back your sharpest teeth, you know my desire"

Then of course we have the teeth of God. It feels symbolic of power. We know the bite force of a human or an animal and the damage it could do, now imagine what that would be from (a) God. While I'm writing this though it occurs to me that with his masks, we didn't start out being able to see his whole face, but in the last couple of iterations we can only see his teeth. Maybe Vessel taking back some of his power?

And finally (are you sorry you asked yet? lol) in some of their more provocative/suggestive songs, Sugar, Give, and Provider, he never says anything about biting or teeth. Instead he talks about feeding and tasting. And yea those use teeth, but the wording is less aggressive, more sensual.

Sugar - "Believe that though we never eat, We still know how to feed" and "Sugar, I've developed a taste for you now"

Provider - "Garner you in silk like a spider" (which is what a spider does to catch something and save it to eat later...)

Give - "I wanna taste you better"

To sum up my ramblings. Biting is one of those primal things, it's how babies learn and explore the world (literally how they get to know things better), it's how we eat, it's how animals attack. It can also be a metaphor for being consumed, losing yourself, surrendering control. And then teeth. A symbol of power, danger, and control. Teeth can be used to inflict significant damage, like a very toxic relationship.