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. 2022 Mar 10;110(3):605–618. doi: 10.1007/s10266-022-00692-x

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© The Author(s) 2022, corrected publication 2022

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Fig. 8 — Individual WID scores among Current, Former, and Never smokers. The diamond points with a black horizontal bar illustrate the means of each study group. High WID values indicate whiter teeth, with low WID values showing discolored or much darker teeth