Pulling hair, thread or gum from the mouth is read as words or feelings that are hard to get out. Tradition sees it as a need to speak, or to clear away something unsaid that has got stuck.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.