Table 1 Search terms used for PubMed-MEDLINE, Cochrane-CENTRAL and EMBASE. The search strategy was customized according to the database being searched

Intervention:

{(<Amoxicillin AND Metronidazole [MeSH] > OR < Amoxicillin AND Metronidazole [textwords]>)

AND

Outcome:

(Periodontal Pocket OR Gingival Pocket OR Periodontal Diseases [MeSH] OR Periodontitis OR periodontal disease OR periodontal diseas* OR pocket depth OR pocket-depth OR periodontal attachment loss OR periodontal pocket OR gingival pocket OR gingival pockets OR periodontal pocket OR periodontal pockets OR clinical attachment loss OR pockets OR probing depth OR probing-depth OR probing-pocket-depth OR probing pocket depth OR papillary bleeding index OR sulcus bleeding OR bleeding on probing OR gingival bleeding OR bleeding on probing OR papillary bleeding index OR bleeding index OR gingival index OR gingival inflammation OR gingival diseases* OR gingivitis [textwords])}