JKAOH Journal of Korean Academy of Oral Health J Korean Acad Oral Health 1225-388X 2093-7784 Journal of Korean Academy of Oral Health 10.11149/jkaoh.2020.44.1.3 jkaoh-44-3 Letter Message for periodontal health promotion by host activation through gingival stimulation of toothpick method WatanabeTatsuo Emeritus Professor Okayama University Dental School, Japan Tatsuo Watanabe Minato 451-172, Naka-ku, Okayama 703-8266, Japan (Office HAT Inc. Haga 5303 ORIC 321, Kita-ku, Okayama 701-1221, Japan) Tel: +81-86-230-6830 Fax: +81-86-230-6831 E-mail: wyobou1@msn.com https://orcid.org/0000-0001-9711-3439 032020 15032020 441 36 Copyright © 2020 by Journal of Korean Academy of Oral Health 2020 This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.