Your dream has the following possibilities:
First, maybe you usually feel guilty that what you said offended others, and wish you would say less. This idea became your subconscious, so the dream grew something in your mouth, blocking your mouth and making you unable to speak.
Second, it may be that you have recently faced something that makes you feel uncomfortable, but you are worried that it may have a bad influence on you, so you just swallow it. In this case, your thoughts will also become subconscious.
Usually dreams can vent people's subconscious. Therefore, your dream gives vent to a subconscious mind that doesn't allow you to speak. If you have something in your mouth, it will directly affect your inability to speak.
I kept pulling, and finally it took a lot of effort to pull my tongue off. It was a smooth bleeding, not much. It's just that the test mechanism of dreams is at work. In your dream, you realize that it is impossible to grow these things. Besides, it's hard for you not to say anything, so you drag them out.