Whether you can get rid of a cavity depends entirely on how far it has progressed. Very early cavities, before a visible hole forms, can actually be reversed at home through remineralization. Once a cavity breaks through the enamel surface, though, no home remedy will fix it. You’ll need a dentist to remove the decay and restore the tooth.
Early Cavities Can Be Reversed
A cavity doesn’t appear overnight. It starts as a weak spot in the enamel where minerals have been pulled out by acid, a process called demineralization. At this stage, the tooth might look chalky white or slightly discolored, but the surface is still intact. This is the one window where you can reverse a cavity without a dental visit.
Your saliva naturally repairs these weak spots. It contains calcium and phosphate, the same minerals your enamel is made of, and when the acid levels in your mouth drop back to normal, those minerals recrystallize into the enamel. Fluoride supercharges this process. When fluoride is present during remineralization, it swaps into the crystal structure of your enamel, creating a version that’s harder and more acid-resistant than what was there originally. This is why fluoride toothpaste is the single most effective tool for stopping early decay.
To give remineralization its best chance, brush twice daily with fluoride toothpaste, use a fluoride mouth rinse, and reduce how often you snack or sip sugary drinks throughout the day. Every time sugar hits your teeth, bacteria produce acid for roughly 20 to 30 minutes. Frequent snacking means your enamel is under near-constant acid attack, and your saliva never gets the chance to repair the damage.
The pH Threshold That Drives Decay
Tooth enamel starts dissolving when the pH in your mouth drops below a critical point, typically around 5.5, though it varies from person to person. People with lower concentrations of calcium and phosphate in their saliva can start losing enamel at a pH as high as 6.5, meaning their teeth are more vulnerable to acid. Under normal conditions, your saliva stays above this critical pH, which is why your teeth don’t just dissolve on their own.
Sodas, fruit juices, candy, and starchy processed foods all push your mouth below that threshold. The bacteria living in dental plaque feed on sugars and produce lactic acid as a byproduct. Limiting sugar is important, but equally important is limiting how frequently you consume it. One candy bar eaten in five minutes is far less damaging than slowly sipping a sugary coffee over two hours, because the prolonged exposure keeps acid levels high.
Xylitol: A Supplement That Fights Cavity Bacteria
Xylitol is a sugar alcohol found in some chewing gums and mints that bacteria can’t use for fuel. When cavity-causing bacteria (primarily Streptococcus mutans) try to metabolize xylitol, they essentially starve. Clinical research shows the effective dose for reducing these bacteria is 6 to 10 grams per day, spread across at least three sessions. That’s roughly 6 to 8 pieces of xylitol gum throughout the day. At lower doses, the effect drops off significantly, so occasional use won’t do much.
What About Oil Pulling and Other Home Remedies?
Oil pulling, swishing coconut or sesame oil in your mouth for 10 to 20 minutes, has some evidence behind it as a supplemental hygiene practice. Clinical trials show it can reduce plaque buildup and gum inflammation at rates comparable to antiseptic mouthwash. The oil reacts with salivary enzymes to form soap-like compounds that help lift biofilm off teeth, and lauric acid in coconut oil has antimicrobial properties against cavity-causing bacteria.
That said, oil pulling is a prevention and plaque-reduction tool. It does not reverse an existing cavity. The same goes for baking soda rinses, charcoal toothpaste, and other popular remedies. None of them can rebuild lost enamel once a hole has formed. If you want to add oil pulling to your routine, treat it as a complement to fluoride toothpaste and flossing, not a replacement.
When a Cavity Needs Professional Treatment
Once decay has eaten through the enamel surface and created an actual hole, the only fix is removing the damaged tooth structure and filling the space. A dentist drills out the decayed portion and restores it with a filling material. The procedure typically takes 20 to 60 minutes per tooth, and you can eat normally within a few hours.
For larger cavities that have destroyed a significant portion of the tooth, a filling alone won’t hold. In these cases, a crown (a cap that fits over the remaining tooth) is needed to restore strength and function.
If the decay reaches the pulp, the soft tissue deep inside the tooth containing nerves and blood vessels, you’ll likely need a root canal. Signs that decay has gone this deep include severe pain while chewing, lingering sensitivity to hot or cold that doesn’t fade when you remove the source, swollen gums near the tooth, or a darkening of the tooth itself. During a root canal, the infected pulp is removed and the inside of the tooth is sealed. Back teeth like molars and premolars almost always need a crown afterward because they bear the force of chewing.
Silver Diamine Fluoride: Stopping Cavities Without Drilling
For people who can’t easily access dental care, or for young children and older adults who may struggle with traditional procedures, silver diamine fluoride (SDF) offers an alternative. It’s a liquid painted directly onto a cavity that kills bacteria and hardens the remaining tooth structure, effectively stopping the decay from getting worse. For root cavities in adults, SDF has shown arrest rates 72% to over 700% higher than placebo, depending on the study.
SDF doesn’t remove the decay or rebuild the tooth. It freezes the cavity in place. The main cosmetic downside is that it permanently stains the decayed area black, which makes it less popular for visible front teeth. Applications are recommended every six months to maintain the protective effect. It requires a dentist’s diagnosis and monitoring, but the application itself takes under a minute and involves no drilling or numbing.
How to Keep New Cavities From Forming
Prevention comes down to three things: starving the bacteria, strengthening the enamel, and physically removing plaque. Brush with fluoride toothpaste twice a day for two minutes each time, and floss once daily to clean the tight spaces between teeth where most cavities start. Reduce the frequency of sugary and acidic foods and drinks. If you do have something sweet, eating it with a meal is better than having it as a standalone snack, because your mouth is already producing extra saliva during meals to buffer the acid.
Drinking water throughout the day, especially fluoridated tap water, helps rinse acid and food particles off your teeth. Chewing xylitol gum after meals can further suppress acid-producing bacteria. And regular dental cleanings, typically every six months, catch early demineralization before it becomes a cavity that needs drilling. The earlier a weak spot is identified, the more likely it can be reversed with fluoride alone.