“…Chronic periodontal disease (CPD) generally refers to the common inflammatory disorders of gingivitis and periodontitis that result from the response of a susceptible host to specific mixed infections induced by periodontopathic microorganisms ( Pihlstrom et al, 2005 ; Saho et al, 2019 ; Van Dyke & Sima, 2020 ). Clinically, CPD can not only lead to swollen gums, receding gums and associated tooth hypersensitivity, tooth mobility, impaired mastication, and finally, tooth loss ( Darby, 2015 ; Jin et al, 2016 ), but also influence the initiation or progression of systemic diseases, such as cardiovascular diseases (CVDs), respiratory diseases, diabetes, osteoporosis, impaired recognition function, and obesity ( Borgnakke, 2015 ; Kinane et al, 2017 ; Otomo-Corgel et al, 2012 ).…”