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Purpose: The objective of this study was to investigate the impact of oral health on the quality of life of patients with head and neck cancer (HNC) before and after oncologic treatment.Methods: Forty cancer-free individuals (Cf group) and 40 HNC patients (Hnc group) were included in this study. Hnc group was also divided into two subgroups: Hnc 1 (pre-cancer therapy, n = 20) and Hnc 2 (post-cancer therapy, n = 20). Participants were asked to complete a short form of Oral Health Impact Profile (OHIP-14). The results were statistically analyzed with the multivariate analysis of variance with post-hoc Scheffé multiple comparison.Results: It was observed a moderate impact on the quality of life on HNC patients, with values on Hnc 2 group significantly higher in the functional limitation when compared to the Hnc 1 group (p < 0.05). When compared to the Cf group, the values found on Hnc group were higher on functional limitation (p < 0.01) and at the total score (p < 0.05), whereas Hnc 2 group had significant superior values on functional limitation (p < 0.01), physical pain (p < 0.05), and total score (p < 0.01) CONCLUSION: These results show that there is an oral impairment that depreciates the quality of life of patients with an experience of HNC, principally after treatment, indicating the importance of the inclusion of professionals responsible for dental and oral care with the oncologic team to monitor the oral condition of these patients. [ABSTRACT FROM AUTHOR]