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. 2021 Dec 8;9:774210. doi: 10.3389/fbioe.2021.774210

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Copyright © 2021 Zhang, Zeng, Wang, Feng, Song, Zhao, Wang and Liu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(i) Schematic illustration indicating the μPAD assembled into a mouth guard by a 3D-printed holder to form the wearable paper-based devices for point-of-care testing of glucose concentration in saliva. (A), (B), and (C) illustrate the arrangement of the μPAD in the 3D-printed holder, the final device before and after integration into the mouth guard, respectively (de Castro et al., 2019). (ii) Photographs (A) of the button-sensor, and schematic illustration showing (B) the assay procedure (Wei et al., 2021).