It lives in the dental calculus, the infected gum disease and purulent tonsillar crypts. T. tenax could be involved in the degradation of periodontal tissue by secretion of various substances such as alkaline phosphatase, and the fibronectin cathepsine as vaginalis. Trichomonas tenax fulfills the requisite of a parasite, causing damage to different mammalian cells and behaving similarly to Trichomonas vaginalis when in contact with target cells in vitro.It has no cysts and is transmitted directly from vegetative form.It lives in the dental calculus, the infected gum disease and purulent tonsillar crypts. T. tenax could be involved in the degradation of periodontal tissue by secretion of various substances such as alkaline phosphatase, and the fibronectin cathepsine as vaginalis. Trichomonas tenax fulfills the requisite of a parasite, causing damage to different mammalian cells and behaving similarly to Trichomonas vaginalis when in contact with target cells in vitro.It has no cysts and is transmitted directly from vegetative form.Trichomonas tenax can easily be detected by phase contrast microscopy on a fresh mounted smear of periodontal pocket biofilm infection.