Dream: Tooth spy

I was in a fictional scenario, inside a video game. In that scenario, I had some sort of important top-secret thing hidden in one of my teeth, but another tooth had a cyanide capsule hidden in it, so that if I tried to look for the top-secret thing and got the wrong tooth, I'd get poisoned. (I knew which tooth was which, and someone else trying to look probably wouldn't get poisoned, so this plan wasn't well thought-out, but it made sense in the dream.)

At one point, I ended up in the middle of a big city, with a few other people (also involved in this scenario), on the sidewalk by an intersection where three streets crossed (one of them at a weird angle). Across the street was a black van waiting for us, stopped at a red light. I started to cross the street, but as I crossed, the van drove away, turning onto one of the crossing streets. Somehow I knew that everyone else who'd been with me managed to get on, even though I didn't see them get on and last I'd seen them they were behind me.

Then I redid that part, tried crossing the street again, and the van drove away again. Then I tried again, same thing. At one point while I was doing this, I noticed the van morphing into a limo, and its license plate changing from "ZOMM" to "ZOOOOM" (which I somehow knew about despite not being able to see it well from where I was). I thought this was strange, both in that it was changing, and in that I don't usually ride limos (but I guess I could this time). Around this time, I remembered the tooth thing from earlier, and realized that I'd recently had dental issues in real life, outside the scenario, and wondered if maybe it wasn't a good idea to have things done to my teeth in this fictional thing.

Eventually I gave up and decided to walk. I walked the opposite way that the vehicle had gone for a few blocks, and eventually came to a big building with a weird asymmetrical curved roof, which was a dentists' office (and also looked very similar to a building from much earlier). I went inside, and found someone who worked there standing in the middle of the big, wide-open lobby. I expected them to know about the scenario and just know what to do, but they didn't, so I had to explain the situation, and they said, "So it's inside the cavity? I just have to pound at it?"

Then I overheard a somewhat-older woman who'd finished the scenario complaining to a different employee about how the tooth thing was causing problems with eating.