As in the present decade, we consider the soft tissue paradigm the prime focus. Treating the face becomes as important as treating the hard tissues. Therefore, it becomes a key factor to quantify the soft tissue response to hard tissue changes following orthodontic treatment to aid in prediction of treatment outcomes. Purpose of the Study: To determine lip morphology changes after four first premolar extractions in patients with bimaxillary protrusion as ratios of hard and soft tissue changes. Materials and Methods: The sample consisted of pretreatment and post-treatment lateral cephalograms of 20 subjects with Class I bimaxillary protrusion who had undergone orthodontic treatment with four first premolars extraction and retraction of upper and lower incisors. Pre and post treatment lateral cephalograms were traced and superimposed by using SN 7˚ plane. Fourteen linear measurements were made. Statistical analysis was performed to analyze the correlation between the hard and soft tissue change by Pearson’s correlation. Results: Significant changes after treatment was found both in dental and lip analysis. The co-relation of hard tissue to soft tissue was calculated as ratio. Conclusion: Statistical analysis revealed that a 1 mm retraction of the incisor cervical point would produce a 0.5 mm retraction of lip. The predictability of this study may be helpful for the clinician in predicting the prognosis of treatment, amount of change in profile of the patient post treatment, and will help in producing a perfect treatment planning.