To see a closed mouth in your dream, signifies your need to express yourself or talk about an issue that’s bothering you. But to dream of an open mouth is a straightforward warning that you tend to use your mouth too much – try to listen more and talk less.
An open mouth with teeth showing indicates a false friend – be on guard.
If you dream that someone is covering your mouth so you can’t talk, this indicates your inability to persuade others into your mode of thinking.
It may also suggest that you gossip too much.