Teeth sliding Out in the mirror

"I was brushing my teeth in my bathroom when two of them just came loose. Not painfully—they just kind of slid out, like they were ready to go. I caught them in my hand before they hit the sink, and I remember staring at them because they looked bigger than they should've. I kept checking my mouth in the mirror, trying to figure out which ones were missing, but every time I looked, the gaps moved around. One second it was my front teeth, then it was two on the bottom. I don't know why that mattered so much, but it did. Then I was at some gathering, maybe a family thing, and I kept covering my mouth when I talked. Nobody seemed to notice, which made me feel worse somehow. I remember thinking I should put the teeth somewhere safe, but I couldn't find a pocket. I woke up before I lost them, still running my tongue over my teeth to make sure they were all there."