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Related Experiment Videos

Contaminated toothbrushes and their disinfection

S D Caudry1, A Klitorinos, E C Chan

  • 1Department of Oral Biology, Faculty of Dentistry, McGill University, Montreal, Que.

Journal (Canadian Dental Association)
|June 1, 1995
PubMed
Summary

Toothbrushes harbor microorganisms, but Listerine and Virkon exhibit potent bactericidal effects. Soaking toothbrushes in Listerine for 20 minutes effectively eliminates bacterial contamination, ensuring oral hygiene.

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Area of Science:

  • Microbiology
  • Oral Hygiene
  • Infectious Diseases

Background:

  • Toothbrushes can harbor a significant microbial load after use by healthy individuals.
  • Assessing the effectiveness of common oral hygiene products and disinfectants against oral microorganisms is crucial.

Purpose of the Study:

  • To quantify microorganisms on used toothbrushes.
  • To evaluate the bactericidal efficacy of various disinfectants against oral microbes and on toothbrush materials.
  • To determine if a Listerine soaking regimen can prevent toothbrush contamination.

Main Methods:

  • Microbial analysis of 20 used toothbrushes to determine colony-forming units (CFU/mL).
  • In vitro testing of disinfectants (Virkon, Listerine, Cepacol, Scope, Plax) against microbial samples and specific bacterial/fungal species.
  • Volunteer study evaluating a 20-minute Listerine soak post-brushing.

Main Results:

  • An average of 4 x 10^3 CFU/mL microorganisms were recovered from toothbrushes.
  • Virkon and Listerine demonstrated significant bactericidal activity, eliminating all tested species and most toothbrush-associated microbes.
  • A 20-minute Listerine soak effectively eliminated bacterial contamination on toothbrushes.

Conclusions:

  • Toothbrushes harbor substantial microbial populations.
  • Listerine and Virkon are effective disinfectants against oral microorganisms found on toothbrushes.
  • A simple Listerine soaking protocol can prevent bacterial contamination of toothbrushes, enhancing oral hygiene practices.

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