After surgical access and realization of flap RARÎ, surgical sites selected to receive the TfdA will be irrigated with saline will be dried with sterile gauze, a period of 10 minutes and waited, until there is no more bleeding. Soon after, will be applied fotossintentizador hydrochloride phenothiazine, whose main component is the toluidine blue at a concentration of 10mg / mL (Helbo Blue, Helbo Photodynamic Sytems, Grieskirchen, Austria), which will be in contact for 3 minutes. Posteriorly, irrigation will be performed with saline solution for removal of the excess fotossensitizador and colored areas are irradiated with a laser diode of wavelength 660 nm, maximum power 60 mW / cm2 and an energy density of 0,6J / cm2 ( Helbo therapielaser, Helbo Photodynamic Systems GmbH & Co KG, Grieskirchen, Austria), for 60 seconds per site. The treatment is carried out in 6 sites on the teeth, totaling six minutes of application of laser light per tooth. Teeth with furcation lesion will increase more 60 seconds into the lesion.