Bacteria that accumulate on a toothbrush during its use while a person has an acute respiratory illness may cause a recurrence of a cold. This was reported to Deia by Spanish anesthesiologist David Callejo.

The expert noted that toothbrushes can become “luxury hotels” for pathogens to multiply during colds, diarrhea, or any oral infection. Bacteria from the mouth, along with dental plaque, settle on the bristles during brushing. The longer a toothbrush is used, the more bacteria accumulate on it. In addition, the humid environment of a bathroom further accelerates the growth of microorganisms.

“If the toothbrush is not replaced after recovery, the illness may return. Continuing to use the same toothbrush after an infection is like taking a shower and then putting on dirty underwear,” the doctor warned.

Callejo also emphasized that storing the toothbrush of a sick person in the same cup as those of other family members increases the risk of cross-infection.