Appendix 1. MEDLINE Ovid search strategy

1. Dental care for disabled/
2. exp Oral hygiene/
3. Oral health/
4. exp Periodontal diseases/
5. exp Periodontics/
6. (periodont$ or gingiv$).ti,ab.
7. exp Dental health surveys/
8. (toothbrush$ or tooth‐brush$ or floss$ or "chewing stick$" or "wood stick$" or toothpick$).ti,ab.
9. (caries or carious).ti,ab.
10. exp dental caries/
11. ((dental or oral or mouth or interdental or interproximal or tooth or teeth or orthodontic or denture$ or brace$ or bracket$) adj3 (irrigat$ or clean$ or brush$ or clens$ or aid$)).ti,ab. 12. ((oral or dental) adj2 (hygiene or care)).ti,ab.
13. ((mouth or teeth) adj3 care).ti,ab.
14. (plaque$ adj5 (remov$ or control$)).ti,ab.
15. ("dental plaque index" or "dental plaque indices" or "DMF$ index" or "DMF indices" or "dmf$ index" or "dmf$ indices" or "periodontal index" or "periodontal indices" or "oral hygiene index" or "oral hygiene indices" or "gingival index").ti,ab.
16. Dental plaque/
17. Health education, dental/
18. ((health$ adj3 promot$) and (dental or teeth or mouth or periodont$ or gingival$ or "oral health")).ti,ab.
19. or/1‐18
20. exp Intellectual disability/
21. Developmental disabilities/
22. ((intellectual or mental) and "developmental disorder").ti,ab.
23. ((intellectual$ or mental$ or learning) adj5 (disabl$ or disabilit$ or deficien$ or impair$ or handicap$)).ti,ab.
24. ((deficien$ or low$) adj3 (cognition or "cognitive function$" or reason$ or intelligence)).ti,ab.
25. ("special needs" or (special adj3 child$) or retard$ or "slow learner$").ti,ab.
26. ("Down$ syndrome" or mongol$ or "De Lange syndrome" or "Prader Willi syndrome" or "Labhart Willi syndrome" or "Royer syndrome" or "Rubinstein‐Taybe syndrome" or "Rubinstein syndrome" or "WAGR syndrome" or "Williams syndrome" or "Broad Thumb Hallux syndrome").ti,ab.
27. or/20‐26
28. 19 and 27