. 2019 Nov 4;2019:6320261. doi: 10.1155/2019/6320261
Copyright © 2019 Shinpei Matsuda et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Frequency of tongue cleaning using a toothbrush.