Abstract
Photodynamic Therapy (PDT) is a treatment modality that have been showing to be promising in many health sciences, such as dentistry and medicine, being applied at microorganisms inactivation and tumor treatment. Due to its low cost, methylene blue (MB), which is a phenothiazine photosensitizer (PS), it has been extensively known in Brazil. Other phenothiazines, such as Azure A, Azure B a…