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Chapter 8160treatment. Choi et al. suggested that the best time for evaluating OHRQoL is 1 year after debonding.38Notably, we did not take into account a possible second operation that may have been required as a follow-up of the first surgery due to complications or a relapse. A second surgery could result in more discomfort and lower OHRQoL, influencing the answers to the questionnaire. Another point that could influence the answers is that the consultation and surgeries were done by different oral maxillofacial surgeons of the Amsterdam UMC. This creates variation in preoperative preparations, provided information, manner of operation, and postoperative support. Further long-term clinical studies should investigate the impact of orthognathic surgery on psychological well-being and OHRQoL in patients. This could lead to better preoperative and postoperative guidance for patients who undergo orthognathic surgery. ConclusionThe main aim of this study was to evaluate the impact of orthognathic surgery on the QoL in patients with various dentofacial deformities in the immediate postoperative period and during follow-up of at least 1 year using the OHIP14NL questionnaire. The OHRQoL was lower in the immediate postoperative period but improved over time compared to baseline. OHRQoL in patients with different facial deformities improved significantly by 1 year after surgery. With this knowledge about changes in OHRQoL after orthognathic surgery, patients can be informed appropriately with realistic expectations.