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ABSTRACTPurposeThis study aimed to evaluate the effect of the components of tobacco smoke from heated tobacco products (HTPs), referred to as Tobacco Smoke Components (TSCs), on tooth movement and the number of osteoclasts in rat models.Materials and MethodsWistar rats were divided into the following groups: control, distilled water-administered, cigarette TSCs-administered, and HTP TSCs-administered. Tooth movement was experimentally induced within each group using the Waldo method. Measurements were performed for tooth movement and the number of osteoclasts.ResultsBoth cigarette and HTP TSCs decreased the number of osteoclasts and delayed the rate of tooth movement. The TSCs of cigarettes were particularly shown to have a stronger effect than the HTPs.ConclusionHTP TSCs significantly affected the rate of tooth movement; thus, orthodontists should be aware of the patient’s smoking status, as well as smoking method (paper or heated), and encourage smoking cessation during treatment.