Objectives: The current study was designed to evaluate the existence of a “lip bumper” effect, which minimizes anterior tipping, during the initial stages of orthodontic therapy utilizing the Damon system. Namely the resistance of the lips to proclination of the incisors produced by very light orthodontic forces. Methods: This preliminary report is based on study models and cephalometric data collected from10 patients. They all exhibited varying degrees of crowding (mean: 4.5 mm lower arch, 5.3 mm upper arch; range: 0.5-7 mm lower arch, 1-8 mm upper arch), and were treated with the Damon system without extractions or inter-dental stripping. Cephalometric records were obtained before treatment and at the end of the early stage of therapy (unraveling). In this opening stage only round Damon copper Ni- Ti archwires were used, in order to achieve initial leveling and alignment. Springs were not utilized to gain space. Measurements of incisor angulation and position in the pre- and post- early stage were compared, using the appropriate statistical tests. Results: In both jaws, the incisors proclined approximately 5 degrees, and the crowns moved forward 2 mm on average. Significant linear correlations were found between initial crowding and lower incisor proclination and advancement (r =0.64 p< 0.03). No significant correlations could be established for the upper incisors. In addition, no significant correlations were found between the variables describing the upper and lower incisor positions, thus suggesting that in each jaw the incisors reacted independently to the force system. Conclusions: The existence of the so called Damon “lip bumper effect” could not be confirmed in this study.