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Exclusion criteria for the present review.
| Exclusion Criteria |
|---|
| Children (under 18 years of age) |
| Participants with fixed or removable orthodontic appliances |
| Participants with removable oral prostheses, such as a denture |
| Participants unable to carry out self-performed oral hygiene |
| Studies not written or translated into English |
| Studies which are not randomised controlled trials |
