Most paranormal researchers advise against the casual use of the Ouija board, suggesting that it can be a doorway to unknown dimensions. “The board itself is not dangerous, but the form of communication that you are attempting often is," says Ghost researcher Dale Kaczmarek of the Ghost Research Society. "Most often the spirits whom are contacted through the Ouija are those whom reside on 'the lower astral plane.' These spirits are often very confused and may have died a violent or sudden death; murder, suicide, etc. Therefore, many violent, negative and potentially dangerous conditions are present to those using the board. Often times several spirits will attempt to come through at the same time but the real danger lies when you ask for physical proof of their existence! You might say, 'Well, if you're really a spirit, then put out this light or move that object!' What you have just done is simple, you have 'opened a doorway' and allowed them to enter into the physical world and future problems can and often do arise."
But what if the Ouija really does not contact spirits? What if it only accesses our own subconscious? The advice might be the same. Since there are realativly few accounts of positive, uplifting experiences with the Ouija, and many negative ones, we might assume that it more attuned to the negative aspects of our subconscious.
If you're determined to use the Ouija anyway, it is highly recommended that you follow some rules of precaution:
Begin by announcing that the session will only allow an experience that is positive or toward a higher good and that negative energies are not welcome.
Don't ask for physical signs.
When you're done, close the board. This is an important step. When you're done with your session, slide the planchette to 'GOODBYE' and remove your hands.