Effect of periodontitis and toothbrushing frequency on obesity onset: A cohort study

Toyoko Morita, Yoji Yamazaki, Misae Seto, Takashi Yamamoto, Kumiko Nakai, Hideki Tanaka, Manami Ozaki, Ryosuke Koshi, Masao Maeno, Takayuki Kawato

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Background: The interplay between obesity and periodontitis has been widely examined. While obesity was reported as a risk factor for periodontitis, the inverse relationship is still little explored. Therefore, we aimed to determine whether periodontitis and toothbrushing frequency affect the onset of obesity. Material/Methods: This cohort study included 1619 employees of a business enterprise headquartered in Tokyo, who in 2002 and 2006 underwent in prescribed annual health checks, both general and dental-specific, and who were not obese in 2002 (body mass index <25). The response variable was obesity (or absence) at 4 years, while the explanatory variables were presence/absence of periodontal pockets and toothbrushing frequency in 2002; their relationships were examined by multiple logistic regression analysis. Results: Subjects with periodontal pockets ≥4 mm showed a significantly higher odds ratio (OR) for onset of obesity at 4 years than those without periodontal pockets [OR: 1.59, 95% CI (confidence interval): 1.08-2.35, p<0.05]. Similarly, subjects who brushed their teeth ≥3 times/day had a significantly lower obesity OR than those who brushed £1 time/day (OR: 0.49, 95% CI: 0.28-0.85, p<0.01). Conclusions: The presence of periodontal pockets and toothbrushing frequency are significantly associated with the onset of obesity. Periodontal pockets ≥4 mm are associated with increased risk of obesity, while frequent toothbrushing (≥3 times/day) appears to reduce the risk of obesity.

Original languageEnglish
Pages (from-to)9712-9720
Number of pages9
JournalMedical Science Monitor
Publication statusPublished - 18 Dec 2019


  • Chronic Periodontitis
  • Cohort Studies
  • Obesity, Abdominal
  • Toothbrushing


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