Biologist Dmitry Safonov has stated that toothbrushes must be replaced every three months to maintain oral health, in comments reported by news outlet aif.ru.
Safonov said the three-month schedule applies to healthy individuals, but anyone recovering from an illness should change their brush immediately to reduce the risk of reinfection. He specified that replacing the hygiene tool is necessary after suffering from acute respiratory viral infections, coronavirus, herpes, or pharyngitis.
Healthy people who use a toothbrush for longer than three months face an increased risk of developing oral health problems. Safonov explained that bacteria naturally found in the mouth accumulate on the bristles over time, specifically highlighting streptococci, fungi, and Candida species.
Streptococci are common bacteria found in the throat and oral cavity, while Candida is a genus of yeasts present on human mucous membranes. Although these microorganisms normally exist in small amounts without causing harm, long-term buildup on bristles can cause inflammation even in a healthy person.
Proper toothbrush storage and care
Safonov emphasized that proper storage is just as critical as regular replacement. He advised that toothbrushes must be stored strictly in an upright position inside a dry glass.
Storing a brush inside a closed container creates a damp environment that allows bacteria to rapidly multiply across the bristles. Air circulation in an open, dry glass allows the brush head to dry completely between uses, preventing microbial growth.
The recommendations follow earlier guidance from dentist Pavel Lysenkov, who addressed why teeth can continue to break down despite good oral hygiene practices. Lysenkov identified the overuse of simple carbohydrates as a primary cause of unexpected tooth decay.
Simple carbohydrates, including refined sugars in processed foods and sugary drinks, are quickly converted into acids by mouth bacteria. These acids erode protective tooth enamel over time, leading to decay regardless of brushing habits.
