A Few Things To Note About Toothbrushes

It is recommended to replace the toothbrush every three months to keep the cavity clean and wear less. Another oft-cited saying about toothbrushes is "replace them every three months." This theory is based on the idea that the bristles will curl and break over time, making an old toothbrush less clean and less hygienic. The three month time frame, however, is based on the extent to which most people's toothbrushes are damaged.

There was some basis for this earlier statement. A 1986 paper published in the Journal of Clinical Periodontology looked at whether old toothbrushes were ineffective at removing plaque. One group did not change their toothbrushes for 10 weeks; Another group changed their toothbrushes every two weeks. After 10 weeks, the researchers compared their gum condition with the amount of dental plaque. They found that the first group had significantly more plaque on their teeth than the second group. There was no difference in gum condition between the two groups. It does seem that an old toothbrush is less effective at removing plaque. Experiments have also shown how different people can be. Some people's toothbrushes are miserable after only two weeks. Some look good after 10 weeks.