You can’t reverse a cavity once it has broken through your enamel, but you can stop early-stage decay before it reaches that point. The distinction matters: a white, chalky spot on your tooth is demineralization that your body can still repair, while a soft, dark hole means the damage is permanent and needs professional treatment. Understanding where your cavity falls on that spectrum determines what will actually work.
Early Decay Can Be Reversed
Cavities don’t appear overnight. They start as “white spot lesions,” areas where acids from bacteria have pulled minerals out of your enamel but haven’t yet created a physical hole. At this stage, the surface is still intact, just weakened. These spots look like flat, milky-white patches on the tooth, often near the gum line or between teeth.
If demineralization continues unchecked, the weakened enamel collapses inward and decay pushes deeper into the softer layer underneath (dentin). The appearance shifts from white to soft brown or black as an actual hole forms. Once that happens, no amount of brushing, rinsing, or diet change will rebuild the lost tooth structure. You need a dentist.
So the honest answer to “how to get rid of cavities” depends entirely on timing. Caught early, you can remineralize the damage at home and with minimal dental intervention. Caught late, you’re looking at fillings, crowns, or more involved procedures.
What You Can Do at Home
For white spot lesions and general cavity prevention, a few daily habits make a measurable difference.
Fluoride toothpaste is the single most effective at-home tool. Fluoride integrates into weakened enamel and makes it more resistant to future acid attacks. Brush twice daily with a fluoride toothpaste and spit without rinsing afterward, so the fluoride stays in contact with your teeth longer.
Xylitol is a sugar substitute that cavity-causing bacteria can’t feed on. When these bacteria consume xylitol instead of sugar, they essentially starve. The effective dose for cavity protection is 6 to 10 grams per day, spread across multiple exposures. That translates to several pieces of xylitol gum or mints throughout the day, not just one piece after lunch. Most xylitol gums contain about 1 gram per piece, so you’d need 6 to 10 pieces daily to hit the therapeutic range.
Diet changes matter more than most people realize. Every time you eat or drink something sugary or acidic, bacteria in your mouth produce acid for about 20 to 30 minutes afterward. Frequent snacking keeps your mouth in a constant acid bath. Reducing sugar frequency (not just total amount) and drinking water after meals helps your saliva do its job of neutralizing acids and depositing minerals back into enamel.
Vitamin D plays a supporting role. A dose-response meta-analysis found that people with the lowest vitamin D levels had a 41% higher chance of developing cavities compared to those with the highest levels. The protective association became significant at blood levels above roughly 78 nmol/L. Getting enough sunlight, eating fatty fish, or taking a supplement can help maintain adequate levels.
Drill-Free Dental Treatments
If your cavity is still in its early stages but beyond what home care alone can fix, several professional options exist that don’t involve a drill.
Silver diamine fluoride (SDF) is a liquid painted directly onto a cavity to stop it from growing. It kills bacteria in the decayed area and hardens the softened tooth structure. The American Dental Association recommends twice-yearly applications to arrest cavities on both baby teeth and permanent teeth. For root cavities in adults, SDF prevented new decay at rates 72% higher than placebo. The major drawback: it permanently stains the treated area black. That makes it a better fit for back teeth, baby teeth in young children, or situations where stopping the decay matters more than appearance.
Resin infiltration works differently. A dentist applies an etching solution to open up the pores in a white spot lesion, then flows a thin resin into those pores. The resin fills the microscopic gaps where minerals were lost, effectively sealing and stabilizing the weakened enamel. It also restores the tooth’s natural appearance by eliminating the white, chalky look. Clinical trials show an 80% patient satisfaction rate, with significant improvement in lesion appearance within the first month. This technique works best on smooth surfaces, particularly front teeth where white spots are cosmetically bothersome.
When You Need a Filling
Once decay has created an actual hole in the tooth, a filling is the standard fix. Your dentist removes the decayed portion and fills the space with a restorative material. The two most common options have different trade-offs.
Tooth-colored composite fillings blend in visually and bond directly to the tooth, but they typically last about 5 to 7 years before needing replacement. Metal amalgam fillings are more durable, lasting 10 to 15 years or longer, but they’re silver-colored and more visible. Many dentists now default to composite for most situations, reserving amalgam for large cavities on back teeth where chewing forces are highest.
The procedure itself is straightforward. After numbing the area, your dentist drills out the decay, shapes the remaining space, and packs in the filling material. Most fillings take 20 to 45 minutes per tooth. You can eat on the treated side within a few hours for composite fillings (they harden immediately under a curing light) or the next day for amalgam (which needs time to fully set).
Larger Cavities Need More Than Fillings
If decay has destroyed a significant portion of the tooth, a standard filling won’t provide enough structural support. In these cases, a crown covers the entire visible portion of the tooth. This typically requires two visits: one to prepare the tooth and take impressions, and a second to cement the permanent crown in place.
When decay reaches the innermost part of the tooth where nerves and blood vessels live, you’ll likely feel sharp, persistent pain or sensitivity to hot and cold that lingers. At this point, the infection needs to be cleaned out through a root canal before the tooth can be restored. Despite its reputation, a root canal feels similar to getting a filling, just longer. The tooth is numbed, the infected tissue is removed, and the hollow interior is sealed.
If the tooth is too damaged to save, extraction becomes the final option. Replacing the gap with an implant, bridge, or partial denture prevents neighboring teeth from shifting and keeps your bite aligned.
How to Keep Cavities From Coming Back
Cavities are a bacterial infection, not a one-time event. The same conditions that caused your first cavity will cause your next one unless something changes. The basics work: brush with fluoride toothpaste twice a day, floss daily to clear bacteria from between teeth where your brush can’t reach, and limit how often you expose your teeth to sugar throughout the day.
Professional cleanings every six months remove hardened plaque (tarite) that traps bacteria against your enamel. Your dentist can also apply concentrated fluoride varnish during these visits, which provides a stronger mineral boost than toothpaste alone. For people who get cavities frequently, prescription-strength fluoride toothpaste or rinses offer an extra layer of protection between appointments.