India has one of the highest rates of mouth cancer in the world among which gingivobuccal cancer (GBC) is the most prevalent. A 45-year-old man was reported to the hospital on November 23rd, 2021, with symptoms of difficulties eating and swallowing meals and pain when executing facial movements for 6 months. Six months ago, the patient was diagnosed with well-differentiated squamous cell carcinoma of the upper right gingivobuccal sulcus after a series of tests, and he has now finished three cycles of neoadjuvant treatment. On December 1, 2021, a right hemi-mandibulectomy with ipsilateral modified radical neck dissection and pectoralis major myocutaneous flap repair was done. Key indicators include pulmonary function, appropriate mouth opening, discomfort alleviation, and wellbeing.The Oral Rehabilitation Program is beneficial, as evidenced by statistically significant improvements in exercise capacity and well-being. This case study represents a comprehensive rehab strategy for people who have had oral surgery.