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To identify and assess differences in oral hygiene parameters in patients undergoing orthodontic treatment with clear aligners compared to fixed appliances. Published and unpublished literature was searched in seven databases until May 31st 2021. Representative keywords included 'orthodontic aligner', 'fixed appliance', 'oral hygiene', 'plaque index', 'caries'. Study selection, data extraction, risk of bias and certainty of evidence assessment were undertaken independently by three reviewers. Random effects meta-analyses with respectiv