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Purpose: To explore the impact of oral hygiene practices, as well as beliefs and attitudes toward orthodontic treatment on white spot lesion (WSL) development and plaque accumulation in orthodontic patients., Materials and Methods: A total of 106 individuals (61 female, 45 male) patients aged 10-49 years who were treated with fixed appliances treatment completed a 14-question survey regarding aspects of their oral hygiene (OH) and orthodontic visits. The number of teeth with WSL and the plaque indexes were recorded for each patient. Poisson regression and linear regression models were used to analyze the association of survey responses with the observed WSLs and plaque accumulation, respectively., Results: Participants of both sexes reported similar beliefs about OH (66% agreed to the importance of OH statements), practiced proper OH (69% good practices), and reported a similar perception regarding the quality of their OH routine and of their orthodontic treatment. However, in total, none of the findings was significantly related to the development of WSLs or plaque accumulation. Significantly fewer WSLs were observed in male patients who perceived themselves as having good control over OH. Female participants reported significantly higher expectations regarding posttreatment smile improvement compared to males. Overall, responses by male participants were deemed to be more accurate than those by female participants when related to WSL development and plaque accumulation., Conclusion: Our survey hints at a possible relationship between WSL formation and patients' sense of control over OH routine in males. Future studies should further explore the effect of sex on the attitude toward and perception of OH in orthodontic patients. This survey highlights the multifactorial nature of WSL development in orthodontic patients and the complexity of predicting patient compliance., (© 2023. Springer Medizin Verlag GmbH, ein Teil von Springer Nature.)