To dream of a teacher suggests that you may need to letting go of current beliefs to allow for growth. You may be holding on to ideals, which you are not wanting to let go, which causes stagnation mentally, physically, and spiritually. In order for growth or change one needs to let go of the past.
To dream of a teacher symbolizes authority, guidance, approval, and direction. You may be seeking help or knowledge and may be wanting to relieve yourself from certain responsibilities. Remember that ultimately you are responsible for your choices.