How Often Should You Replace Your Toothbrush? A Dentist Provides Answers
When it comes to hygiene, few habits are as ingrained as taking care of your teeth. Brush at least twice a day, floss at least once a day, and see your dentist for a thorough cleaning every six months. One habit that often gets overlooked, however, is knowing when to replace your toothbrush. That’s especially important after age 50, when oral health becomes increasingly linked to your overall health.
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When Should You Replace Your Toothbrush?
As a general rule, the American Dental Association recommends changing your toothbrush every 3 to 4 months.
Dr. Fatima Khan, a dentist and the co-founder at Riven Oral Care noted that you can change your brush sooner if it already looks worn or starts fraying. “You want to replace it because it may not be as effective in plaque removal and may be damaging to your gums.”
Here are some visual signs it’s time to change:
- Bristles are frayed, splayed, bent, or no longer spring back.
- Brush head looks flattened or matted.
- Bristles look discolored.
- Brush has a persistent odor.
Other Reasons for Replacing Brushes
Dr. Khan recommends replacing your toothbrush sooner — even if it still looks fine — in the following situations:
- After treatment for gingivitis or periodontitis. If your gums were bleeding because of gum disease, replace your toothbrush after your dentist has treated the infection to help prevent harmful bacteria from re-colonizing the brush.
- If you have oral thrush. Replace your toothbrush several times while the infection is clearing to reduce the chance of reintroducing the fungus.
- After a viral illness. If you’ve had a cold, flu, COVID-19, or another viral infection, replace your toothbrush once you’ve recovered.
You should also change it if you drop it on an unsanitary surface.
“As we age the quantity and quality of our saliva diminishes and people suffer from dry mouth. That can increase the risk for bad breath, cavities, canker sores, fungal infection and gum disease.”
Dr. Fatima Khan, a dentist and the co-founder at Riven Oral Care
Dentures Are Not an Exception
The same schedule should be followed whether you have natural teeth, dentures, or dental implants. Many people assume that once they have dentures, oral hygiene is no longer a concern. This is a misconception.
In fact, wearing dentures alters the oral microbiome significantly, increasing the risk of infection if they aren’t cleaned properly. This can lead to infections such as inflammation of the gums and palate, and may even increase the risk of pneumonia if bacteria from contaminated saliva are accidentally breathed into the lungs.
Why the Need to Change?
A worn toothbrush isn’t likely to make you seriously ill on its own. The bigger concern is that worn bristles don’t remove plaque as effectively.
A toothbrush is a precision cleaning tool. When its bristles are in good condition, they effectively sweep plaque and residue away from your teeth and along the gum line. As the bristles wear down, their cleaning ability declines.
A 2019 Japanese study found that a toothbrush removed significantly less plaque after two months of use than when it was brand new. Another study followed 172 people for one year and checked how worn their toothbrushes became after every 3 months of use. Those with extremely worn toothbrushes had significantly higher plaque scores than those whose brushes showed no visible or only light wear.
When plaque isn’t adequately removed, it hardens into tartar, triggers gum inflammation, and can eventually lead to cavities, gum disease, and infections that damage the bone supporting your teeth. As toothbrushes age through repeated use, they also accumulate microbial biofilms — sticky communities of microorganisms that cling to surfaces — on their bristles.
Some of these microorganisms may come from contaminated surfaces or tiny airborne droplets released when a toilet is flushed. If your toothbrush is stored nearby and left uncovered, some of these droplets may settle on the bristles.
While there’s no clear evidence that bacteria found on toothbrushes cause health problems in otherwise healthy adults, minimizing unnecessary bacterial exposure is still a sensible precaution, especially for older adults with weakened immune systems.
Why Oral Hygiene Matters More With Age
As we age, taking care of our mouths becomes even more important. Natural changes in the mouth, along with certain medications and health conditions, increase the risk of dry mouth, cavities, gum disease, and tooth loss.
“As we age the quantity and quality of our saliva diminishes and people suffer from dry mouth. That can increase the risk for bad breath, cavities, canker sores, fungal infection and gum disease,” explained Khan.
Saliva is your mouth’s natural defense system. When there isn’t enough of it, the risk of tooth decay, gum disease, and oral infections increases. Many older adults also take medications that can cause dry mouth, further increasing these risks.
Age also increases the risk of gum disease. Nearly half of adults age 30 and older have gum disease, compared with about 70% of adults age 65 and older. Khan added that enamel naturally becomes thinner and gum recession becomes more common with age, increasing the risk of cavities and tooth sensitivity.
Oral Hygiene on Overall Health
Still, getting older doesn’t automatically mean you’ll develop oral health problems. Khan said that your oral hygiene routine, diet, tobacco use, genetics, medications, and overall health all play an important role in keeping your mouth healthy.
The importance of maintaining good oral health goes beyond protecting your teeth and gums. Research increasingly suggests that the health of your mouth is closely connected to the health of the rest of your body, especially as you get older. One leading theory is that harmful bacteria from the mouth can enter the bloodstream through tiny breaks in the gums caused by everyday activities like chewing, brushing, flossing, or dental procedures.
Your immune system responds by attacking these bacteria, triggering inflammation. Over time, repeated episodes of inflammation may contribute to plaque buildup inside blood vessels, increasing the risk of heart attacks and strokes. Tooth loss is one of the most common consequences of poor oral hygiene. But losing teeth isn’t just a dental issue — it may also be linked to poorer overall health.
One review found that having fewer than 10 teeth was associated with a higher risk of death from cardiovascular disease.
Similarly, a landmark Korean study found that each missing tooth was linked to about a 1% higher risk of heart attack, a 1.5% higher risk of heart failure and stroke, and a 2% higher risk of death. People with five or more missing teeth also had a substantially higher risk of cardiovascular disease.
A Small Habit That Protects More Than Your Smile
Replacing your toothbrush every few months may seem like a small habit, but it’s one of the easiest ways to keep your mouth clean and your brushing effective. Combined with brushing twice a day, flossing, and regular dental checkups, it can help protect not only your teeth and gums but also your overall health as you age.
