The aim of this study was to assess the patient’s attitude and follow the progress of patient’s adaptation to discomfort with the use of fixed twin block. Materials and Methods: A total of 20 patients undergoing treatment with fixed twin block rated their experiences after 7 days, 14 days and 30 days of appliance insertion. Results: The majority of respondents reported being affected by (in descending order) sore teeth, pain in the jaw, headache, muscle pain and sleep discomfort. These negative effects generally decreased over time. Discomfort with functional activities seemed to be at its maximum during the initial days with all the patients having discomfort while eating. 75% and 85% patients had discomfort while speaking and tissue soreness respectively. However, functional activities improved with progressive use of the appliance. Conclusion: The results of the study indicate that most patients experience some discomfort and functional limitations; however, the effect generally diminishes with time and patients adapt to the appliance