Until now, scientists have not reached a consensus about the mechanism of occurence and development of the gum disease. There are more than twenty scientific theories of periodontal disease. But the most popular is lack of hygiene and in particular of oral hygiene. In case of improper dental hygiene on the surface of teeth accumulates plaque that is not removed with teeth brushing. Besides i the human mouth live numerous microorganisms that are not dangerous for to human tissue so called opportunistic microorganisms. But its waste products are very toxic and that destroy gums cells. Periodontists in Arizona will help you to choose proper means for oral hygiene and teach how to do it properly.