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These results suggest that the biological process involved in somatoform pain disorder of the oral region is characterized by changes in limbic and cortical functions. The finding that somatoform pain disorder with oral symptoms is associated with brain functional changes will help to develop treatment regimes for this disorder and clarify the underlying pathology.

Managing oral health through regular dental checkups (RDCs) can help prevent dental diseases. Our study aimed to investigate the proportion and characteristics of those who stopped receiving RDCs owing to the coronavirus disease 2019 (COVID-19) pandemic. A nationwide web-based survey in Japan in September 2021 (3556 participants) revealed that 62.4% of participants had habitually received RDCs before COVID-19. Of these (n = 2219), 71.5% had received RDCs since the pandemic and 28.5% had not. Multiple logistic regression analysis revealed the following characteristics of those without RDCs since the pandemic: female (male, OR: 0.58, 95%CI: 0.45–0.74), lower household income (<2000 K JPY, OR: 1.45, 95%CI: 0.94–2.23; 2000 K–< 4000 K JPY, OR: 1.46, 95%CI: 1.08–1.98), fewer teeth (20–27, OR: 0.63, 95%CI: 0.39–1.03; ≥28, OR: 0.60, 95%CI: 0.36–0.98), and no interdental cleaning habits (OR: 0.51, 95%CI: 0.41–0.63). These results suggest that the disruption to RDCs owing to the pandemic is related to individual socioeconomic factors. Additionally, these individuals have poor oral health, which may be worsened by such barriers.

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