This study addresses the nature of morphological changes occurring in periodontal tissues through the development of gum recession in the experiment. Gingival recession was found to occur along with a decrease in epithelial thickness of the mucous membrane as well as a decreasing cross-sectional area of blood vessels, whereas the connective tissue featured fibrinoid swelling. Initial tissue ischemia in the affected area can have a negative effect on reparation. This should be borne in mind when planning a periodontal plastic surgery.