Right now your toothbrush is home to something like 1-12 million bacteria and fungi belonging to hundreds of different species, alongside countless viruses.
But before we even use a toothbrush for the first time it can carry its own community of microbes.
Bacteria such as Streptococcus mutans, which are a major contributor to tooth decay, can remain viable on toothbrush bristles for up to eight hours but by 12 hours they begin to die off.
The microwave is often found to be the most effective, but also risks melting or damaging the bristles of your toothbrush.
Rinsing it in water also helps to flush some of the bacteria down the plug hole, but many bacteria still cling on and grow.
The cold sore virus, yeast that causes thrush, and bacteria from our toilets can all flourish on toothbrushes. It is possible to keep your toothbrush a bit cleaner, though.
A tiny, repulsive ecosystem is your toothbrush. Each day, the dry scrubland created by its fraying bristles is momentarily flooded, turning it into a nutrient-rich wetland. Millions of organisms thrive among the dense groves of tall plastic stalks.
There are currently between 1 and 12 million bacteria, fungi, and viruses from hundreds of different species living in your toothbrush. They worm their way into the broken stalks of aging bristles or create biological films on the brush’s exposed surfaces. These microbes have everything they need to survive thanks to the daily inflow of water, saliva, skin cells, and food particles from our mouths. They are occasionally joined by a shower of additional microorganisms that enter through a window opening or the flush of a nearby toilet.
Additionally, you swallow this delicious cocktail twice a day to give it a good shake.
So, is the cleanliness of your toothbrush more important to you?
For years, dentists and physicians have been grappling with this question, which has led them to investigate what exactly is on our toothbrushes, the dangers those microbes present, and the best ways to clean our tooth-scrubbing tools. Additionally, this article by Martha Henriques provides additional information on how to brush your teeth in accordance with science. ().
The origin of the microbes.
“The microbes on toothbrushes primarily originate from three sources,” according to Marc-Kevin Zinn, a microbiologist who has researched toothbrush microbial contamination at Rhine-Waal University of Applied Sciences in Germany. These are the toothbrush’s storage space, the user’s mouth, and their skin.
The toothbrush itself, however, may harbor its own microbial community before we even use it for the first time. For instance, a study of 40 brand-new toothbrushes from various manufacturers that were purchased from Brazilian retailers revealed that half of them were already tainted with various bacteria.
The majority of us also frequently keep our toothbrushes in the bathroom with the toilet.
Thankfully, the majority of the bacteria that are present on our used toothbrushes are not very harmful. It should come as no surprise that the majority originate from our own lips. The bristles of the brush collect microorganisms like Rothia denocariosa, Streptococcaceae mitis, and Actinomyces bacteria, which are typically harmless oral residents, every time we place it in our oral cavity. In fact, some of those that adhere to the toothbrush head and bristles may be good for us by shielding us from other bacteria that lead to tooth decay.
However, there are hitchhikers among them who actually do pose a threat to us.
dangerous bacteria.
According to Vinicius Pedrazzi, a professor of dentistry at the University of São Paulo in Brazil, “the most important are Streptococci and Staphylococci, which cause tooth decay.”. Others may result in periodontal disease, an inflammation of the gums.
Additionally, researchers have discovered bacteria and fungi that shouldn’t be on used toothbrushes, including Escherichia coli, Pseudomonas aeruginosa, and Enterobacteria, which are more frequently linked to food poisoning and stomach infections. Additionally, studies have found that toothbrushes contain pathogens like Candida yeasts, which can cause thrush, and Klebsiella pneumoniae, which is a common cause of hospital-acquired infections.
The water we use to rinse our brushes, our hands, and other areas of the “environment” are these microbes’ sources. However, keep in mind that your bathroom is probably that setting.
Bathrooms are warm, humid spaces that frequently fill with aerosols, which are tiny water droplets that can spread viruses and bacteria. Because of this, Zinn claims that toothbrushes stored in restrooms are particularly vulnerable to contamination.
Additionally, the majority of us keep our toothbrushes in the bathroom with the toilet. And just so you know, things get pretty disgusting from here.
the plume from the toilet.
A plume of tiny water and fecal droplets is thrown up to 1 0.5 meters (5 feet) into the air surrounding the toilet every time it is flushed. Infectious viruses and bacteria, including those that cause the flu, COVID-19, and the norovirus that causes winter vomiting, can be carried by this aerosol-like spray.
It’s possible that the contents of your toilet bowl will end up sticking to the bristles of your toothbrush if you happen to keep it nearby. The risk of directly breathing in infectious microorganisms during flushing is higher, but you might want to reconsider leaving the toilet seat up before flushing in the future. Find out more about the possibility of contracting diseases from toilet seats. ).
Perhaps the issue is greater in shared restrooms, where studies at one university discovered that 60% of student toothbrushes were tainted with bacteria from feces, and that there was a high probability that microbes on one person’s brush originated from another.
However, Erica Hartmann, an associate professor of engineering at Northwestern University in Illinois, USA, who focuses on the survival of microbes in natural settings, isn’t sure that the toilet plume is as concerning as some people think. 34 toothbrushes submitted by members of the public in Illinois were found to contain fewer fecal-related bacteria than might be predicted based on the work of her own team. According to research cited by her, many of these gut-associated microbes do not have a long survival time in the air.
The majority of people, she believes, are not becoming ill because of their toothbrush.
However, some studies have shown that viruses like coronaviruses and influenza can live on toothbrushes for a few hours, and in the case of the cold sore-causing virus, herpes simplex virus-1, for as long as 48 hours. Sharing toothbrushes could be a potential source of disease transmission, which is why public health advises against it. Additionally, public health organizations advise against letting toothbrushes come into contact with one another when multiple toothbrushes are kept together, especially when they belong to people you do not live with.
Hartmann, however, believes that those who do live together are less concerned about this. “A greater percentage of oral microbes are shared by people who live together than by those who do not,” she claims. In contrast to the less indirect method of sharing or the more direct method of kissing, I doubt that this is motivated by such an indirect method as keeping toothbrushes nearby. Notably, dog owners frequently have a lot of the same microbes as their pets.
Hartmann and her team discovered that toothbrushes harbor thriving communities of viruses called bacteriophages, which infect bacteria rather than humans and can help control their numbers. This suggests that some of the viruses found on toothbrushes may actually be beneficial to us.
What’s at risk?
Zinn agrees that the risk of infection is generally low, but for people with weakened immune systems, who are more vulnerable to infections, this could be a greater worry. Zinn’s study and other comparable investigations that have sequenced toothbrush bacterial DNA have discovered that at least some of these bacteria possess genes that confer antibiotic resistance. As a result, they are more difficult to treat if they do cause infections. Zinn, however, notes that these genes were “at relatively low levels” in his study and thus only pose “a moderate concern from a public health perspective.”. However, a study of 50 toothbrushes belonging to Italian students discovered that every single one of them contained bacteria that were resistant to several medications.
Some toothbrushes are marketed as a means of controlling the bacteria that live on your brush because they contain antimicrobial treatments. The majority of research, however, suggests that these treatments have little effect on the quantity of bacteria that live on your brush and may even increase the number of species that are resistant to antibiotics.
As a matter of fact, one easy method to lessen the microbes that live in your toothbrush is to let it air dry at room temperature while standing tall. A lot of viruses, such as coronaviruses and influenza, decompose when they dry out. On toothbrush bristles, bacteria like Streptococcus mutans, a leading cause of tooth decay, can survive for up to eight hours before starting to disappear after twelve.
Not covering toothbrush heads or keeping them in closed containers can promote microbial growth, according to the American Dental Association and, until recently, the US Centers for Disease Control and Prevention.
How to keep your toothbrush clean.
There is a confusing variety of methods for sterilizing toothbrushes, ranging from exposing them to UV light to putting them in the microwave or dishwasher. It has been discovered that using a hair dryer or immersing your brush in a glass of whisky are two of the least successful methods. Although the microwave is frequently the most efficient, there is a chance that it will melt or harm your toothbrush’s bristles.
Your toothpaste, which frequently contains antimicrobial qualities, can help lessen the quantity of bacteria that grows on your brush. While some bacteria can be flushed down the plug hole by rinsing it in water, many bacteria continue to grow and adhere.
The most efficient method of lowering bacteria, according to some researchers, is to use a solution of 1% vinegar; however, this will leave a taste that some people will find disagreeable the next time they use their brush. The brush head can also be effectively soaked for five to ten minutes in an antiseptic mouthwash solution.
For example, a company in New Zealand is testing Streptococcus salivarius, which is known to help fight plaque and suppress harmful bacteria. Another that may provide tooth decay protection is Limosilactobacillus reuteri, which fiercely competes with Streptococcus mutans.
Zinn says that “ideas like probiotic coatings or bioactive bristle materials might offer innovative ways to promote a healthy microbial balance on toothbrushes, turning them into vectors of protection rather than risk.”. However, he issues a warning that much more research in this field is still necessary.
Meanwhile, you may want to examine that brush in your bathroom more closely. Perhaps it should be moved farther away from the toilet, or maybe it should be replaced.
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