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. 2021 Feb 4;18(4):1468. doi: 10.3390/ijerph18041468

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Plaque Index, the mean values of Plaque Index (changes) in relation to the number of patients in each study at each time-point: blue color corresponds to ORHs and black to SAHs toothbrushes [41,42,43,44,45,46,47,48,49,50,51,52].