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Related Experiment Video

Updated: Sep 27, 2025

Mimicking and Measuring Occlusal Erosive Tooth Wear with the "Rub&Roll" and Non-contact Profilometry
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Relationship between Toothpaste Dilution Ratio and Droplets Generated during Tooth-Brushing.

Ryouichi Satou1, Atsushi Yamagishi1,2, Atsushi Takayanagi1,2

  • 1Department of Epidemiology and Public Health, Tokyo Dental College, Tokyo 101-0061, Japan.

International Journal of Environmental Research and Public Health
|April 12, 2022
PubMed
Summary

Using toothpaste during brushing reduces droplet generation and spread, crucial for preventing infection transmission. Less diluted toothpaste produces fewer droplets with shorter flight distances.

Keywords:
coronavirusdroplettooth-brushingtoothpaste

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Area of Science:

  • Oral hygiene practices
  • Infectious disease transmission
  • Aerosol science

Background:

  • Lack of guidelines for toothpaste use in public during epidemics.
  • Unknown impact of toothpaste on droplet generation during brushing.

Purpose of the Study:

  • Investigate toothpaste dilution, viscosity, and droplet generation.
  • Quantify droplet number and flight distance with varying toothpaste concentrations.

Main Methods:

  • Developed a system to measure droplet generation during tooth-brushing.
  • Tested brushing with water and different dilutions of toothpaste.
  • Analyzed relationships between viscosity, droplet count, and flight distance.

Main Results:

  • Brushing with water generated significantly more droplets than diluted toothpaste.
  • Undiluted toothpaste produced no droplets.
  • Higher toothpaste dilution and lower viscosity correlated with increased droplet numbers and flight distances.

Conclusions:

  • Less diluted toothpaste significantly reduces aerosolized droplets during brushing.
  • Using an appropriate amount of toothpaste can mitigate infection risk via droplet spread.