Search strategy and data sources
gingivitis
PERIODONTAL INFECTION, PERIODONTITIS, CHRONIC PERIODONTITIS, GINGIVITIS, GUM DISEASE, PERIODONTAL DISEASE, VITAMIN D DEFICIENCY
Five electronic databases including PubMed, Web of Science, MEDLINE, EMBASE, and the Cochrane library were searched from the inception of the database until september 12, 2022. And the search was carried out by means of subject headings combined with free text words to encompass all articles related to administration of vitamin D and periodontal non-surgical treatment. The specific search strategy was (“periodontitis OR periodontal disease* OR periodontal OR gum disease* OR gingivitis OR chronic periodontitis OR periodontal infection* OR periodontal health”) and (“vitamin D OR 25-hydroxy-vitamin OR Twenty five-hydroxy vitamin D OR 25OHD OR 25-hydroxyvitamin D OR 25(OH)D OR calcitriol OR vitamin D supplementation OR vitamin D deficiency OR vitamin D receptor OR VDR”). In addition, the reference lists of all selected articles were also reviewed for potentially relevant studies.