Context: Class II malocclusion is considered as one of the most prevalent types of malocclusion encountered in routine orthodontic practice and described by an improper relationship among the upper and lower jaws caused by dental or skeletal problems or a combination of both. Aims and Objective: To evaluate the effects of early treatment of Class II Division 1 malocclusion by modified Teuscher activator with lip bumper. Materials and Methods: The current prospective clinical study consisted of

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... 5 subjects (8 girls and 7 boys) with skeletal Class II Division 1 malocclusion due to retrognathism of the mandible with the mean chronological age of (10.4 ± 0.6 years). Lateral cephalograms were taken before (0) and after (1) treatment. Results: Treatment of growing patients with modified Teuscher activator led to correction of Class II Division 1 malocclusion by advancement of mandible (SNB; 2.61°), increase of mandibular length (Co-Gn; 3.58 mm), restriction of maxillary growth (SNA; 0.13°), and decrease of overjet (5.45 mm). Conclusion: Modified Teuscher activator was an effective appliance in managing growing patients with Class II Division 1 due to mandibular retrusion.