RecruitingDevice studyIntraoral Photobiomodulation Therapy to Prevent Oral Mucositis in Patients Undergoing Hematopoietic Cell TransplantationThis is a single center pilot study evaluating intraoral photobiomodulation for the prevention of oral mucositis in patients undergoing myeloablative allogeneic hematopoietic cell transplantation (alloHCT). Patients who are planned for alloHCT will receive daily intraoral photobiomodulation therapy (PBMT) using a novel LED device. The name of the study device involved in this study is: \- THOR LX2.3 with LED Lollipop