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Oral hygiene status was assessed based on the Tongue Coating Index (TCI) [30], which was modified slightly in this study as follows. The tongue was divided into the anterior, central, and posterior sections. The degree of tongue coating was evaluated on a two-point scale and recorded as “with tongue coating“ or “without tongue coating” by visual examination. Poor oral hygiene was diagnosed as shown in Table 1.
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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 (https://creativecommons.org/licenses/by/4.0/).
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