I had a similar experience years ago when I knew it was time for a third (and final) separation from my ex-husband. I had initiated the first two separations and I wanted him to leave on his own without my having to tell him to go.
This went on for months. I kept dreaming about my teeth crumbling in my mouth and I had to keep spitting them out or risk choking on them. Gross, I know! My spiritual director at the time told me that when you dream about something going wrong with your mouth, it means you need to say something to somebody and you’re not saying it. She said that the worse the problem was with your mouth in your dream, the more important it was to say the thing.
I was having this dream at least twice a week. When I finally told him to leave, I stopped having the dream.