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. 2017 Mar 23;17:78. doi: 10.1186/s12877-017-0466-8

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Oral screen training. (Left) The oral screen is inserted predentally, behind closed lips. (Right) The patient must press the lips firmly together, then strongly pull the handle straight forward, away from the mouth, and maintain pressure for 5–10 s. Illustrations: Mary Hägg©