Dairy toothbrushing habit is effective to prevent the aggravation of COVID‐19 infection

Aim The outbreak of the new Coronavirus Disease 2019 (COVID‐19) has spread and caused a public healthcare crisis. The habit of toothbrushing is the critical and fundamental measure for controlling the oral health. There has been no report on whether tooth brushing habit is associated with a risk of severity of COVID‐19 infection. We examined the association between toothbrushing habits and the severity of COVID‐19 infections. Methods The cross‐sectional data were used from the Japan COVID‐19 and Society Internet Survey (JACSIS), a large‐scale Internet survey conducted in 2022 ( n = 32 000). If the severity of COVID‐19 infection worsens, hospital treatment or the respiratory ventilator treatment may be required. We examined whether daily toothbrushing is a factor on the suppression of the exacerbation of COVID‐19 infection. Results From all participants, 4756 people were diagnosed with SARS‐CoV‐2 infection. Multivariable logistic regression analysis showed that toothbrushing habit was a significant factor related to the severity of COVID‐19 infection. Conclusion Daily toothbrushing is a very important factor for preventing the exacerbation of COVID‐19 infection.