To evaluate the quality of oral health care through indicators in patients undergoing hematopoietic stem cell transplantation for the management of oral mucositis. Thirty-five patients were evaluated. Photobiomodulation was performed during the conditioning regimen, 1day, 5days, and 10days after transplantation. Four process indicators and 13 outcome indicators were used to evaluate the effectiveness of the intervention, according to SQUIRE 2.0. All process indicators demonstrated a compliance rate of 100% to the desired standard. Outcome indicators revealed that 66.6% of patients experienced mucositis during at least one follow-up period. A statistically significant increase was observed between periods of 1 and 5days post-transplant, as well as between 1 and 10days post-transplant (p < 0.05), with a predominance of grade I mucositis (p = 0.014). Four patients (16.7%) reported feeling pain, occurring between 5 and 10days after transplantation, with moderate pain being the most prevalent. Oral mucositis did not show a statistically significant association with pain, associated treatments, leukopenia, comorbidities, or type of transplant. The indicators demonstrated their suitability for evaluating oral health in both the prevention and treatment of oral mucositis in these patients. Furthermore, the effectiveness of photobiomodulation in improving the quality of oral health in the patients studied was confirmed.