The survey was conducted at medical facilities on one designated date set for each institution from three days in October.
The number of patients refers to those who were continuously receiving medical treatment (including those who did not receive medical treatment at medical institutions on the dates of the survey) calculated by the following formula:
number of patients receiving medical treatment = estimated number of inpatients + estimated number of initial visit outpatients + (estimated number of return visit outpatients × average interval since last visit × adjustment factor (6/7))
Citation formats
Number of patients with dental and oral diseases Japan 2020, by classification
In 2020, around *** million people in Japan were treated for gingivitis and periodontal diseases. At the same time, close to *** million people were receiving treatments for dental caries.
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MHLW (Japan). (June 30, 2022). Number of patients receiving treatments for dental and oral diseases in Japan in 2020, by disease classification (in 1,000s) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 30, 2026, from /statistics/1341675/japan-number-patients-dental-oral-diseases-by-classification/
MHLW (Japan). "Number of patients receiving treatments for dental and oral diseases in Japan in 2020, by disease classification (in 1,000s)." Chart. June 30, 2022. ÌÇÐÄÆƽâ°æ. Accessed July 30, 2026. /statistics/1341675/japan-number-patients-dental-oral-diseases-by-classification/
MHLW (Japan). (2022). Number of patients receiving treatments for dental and oral diseases in Japan in 2020, by disease classification (in 1,000s). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 30, 2026. /statistics/1341675/japan-number-patients-dental-oral-diseases-by-classification/
MHLW (Japan). "Number of Patients Receiving Treatments for Dental and Oral Diseases in Japan in 2020, by Disease Classification (in 1,000s)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 30 Jun 2022, /statistics/1341675/japan-number-patients-dental-oral-diseases-by-classification/
MHLW (Japan), Number of patients receiving treatments for dental and oral diseases in Japan in 2020, by disease classification (in 1,000s) ÌÇÐÄÆƽâ°æ, /statistics/1341675/japan-number-patients-dental-oral-diseases-by-classification/ (last visited July 30, 2026)
Number of patients receiving treatments for dental and oral diseases in Japan in 2020, by disease classification (in 1,000s) [Graph], MHLW (Japan), June 30, 2022. [Online]. Available: /statistics/1341675/japan-number-patients-dental-oral-diseases-by-classification/
