A good introduction on this subject at http://www.youtube.com/watch?v=1bv4WR9cnY4 and http://www.youtube.com/watch?v=nBwiNQphxcc&feature=related. Some text below from http://www.hugnet.com. (Between Quackwatch, Aetna and other detractors such as some Dental Associations that know better, Cavitat Corp. has been forced into bankruptcy).
Found under a series of names, such as NICO (Neuralgia-Inducing Cavitational Osternecrosis) and Alveolar Cavitational Osteopathy, a cavitation is a hole within the upper or lower jaw bone. This hole is roughly the size and shape of the root that once occupied that space in bone, because that was its origin. It is an area of incomplete healing.