Sometimes when we dream, our subconscious mind will convey a message to us. Fangs represent hurtful words in our lives. Sharp teeth can be symbolic of unkind words, or words that are used to hurt others.
For example, if someone is telling you something hurtful and they have sharp teeth, it means that they are a mean person and don’t intend to do anything other than harm you.
If you are thinking about harming yourself with your own fangs in your dream, it means that there is some pain in your life that you need to address and deal with before it consumes you.
Also, when someone tells us many negative things in succession or we ourselves say many negative things this could lead to the development of sharp-toothed dreams or fanged nightmares.