Whether you can get rid of a cavity depends entirely on how far it has progressed. Very early decay, before an actual hole forms in the tooth, can be reversed through remineralization. Once a cavity has broken through the enamel surface, no amount of brushing, rinsing, or dietary changes will close that hole. At that point, you need professional treatment. Understanding where your decay falls on this spectrum is the most useful thing you can do.
Early Decay Can Actually Reverse Itself
Tooth decay isn’t an on/off switch. It’s a back-and-forth process where minerals are constantly being pulled out of and redeposited into your enamel. When the balance tips toward mineral loss for too long, you get a cavity. But in the earliest stage, your body has a real shot at fixing the damage.
The first visible sign of trouble is a white spot lesion: a chalky, matte-white patch on the tooth surface. This means minerals have been stripped from the enamel, but the surface is still intact. No hole exists yet. Saliva naturally contains calcium, phosphate, and buffering agents that can redeposit minerals back into these weakened areas. Researchers have confirmed that with consistent plaque removal and regular exposure to saliva, these white spot lesions can shrink or disappear entirely. The process is slow, sometimes taking months, but it works.
Once decay pushes deeper and the enamel surface actually breaks, you’ll notice different signs. The area may look opalescent or pearly white rather than chalky, and eventually you’ll see dark spots or feel a rough, catchable edge with your tongue. At this stage, the damage is permanent. No home remedy or professional rinse will rebuild a hole in your tooth.
Fluoride: The Strongest Tool for Early Cavities
Fluoride accelerates remineralization and makes repaired enamel more resistant to future acid attacks. It’s the single most effective intervention for decay that hasn’t yet become a full cavity.
Over-the-counter fluoride toothpaste (1,000 to 1,500 ppm) provides a baseline level of protection with twice-daily brushing. For white spot lesions or high-risk patients, dentists apply concentrated fluoride varnish directly to the teeth. A Cochrane review found fluoride varnish reduces cavities in baby teeth by 37%, and individual studies show it can arrest (stop the progression of) existing decay in about 42% of cases at 12 months.
Prescription-strength fluoride rinses or gels are another step up. Your dentist may recommend these if you have dry mouth, a history of frequent cavities, or active white spot lesions. The key with all fluoride products is consistent, repeated exposure over time rather than a single application.
Silver Diamine Fluoride for Active Decay
Silver diamine fluoride (SDF) is a liquid painted onto cavities that have already formed. It doesn’t fill the hole, but it kills bacteria inside the cavity and hardens the remaining tooth structure so the decay stops progressing. The American Dental Association notes that SDF is as effective at halting cavity progression as drilling and placing a filling, while costing up to twenty times less.
For root cavities in adults, SDF prevented new decay at rates 72% higher than placebo treatments. The major tradeoff: it permanently stains the decayed area black. This makes it a practical choice for back teeth, baby teeth in young children, or situations where traditional dental work isn’t feasible. It’s not a cosmetic solution, but it can buy significant time or serve as a permanent stop for decay in the right circumstances.
When You Need a Filling
If decay has created an actual hole in your tooth, a filling is the standard fix. The dentist removes the decayed portion and fills the space with a restorative material. The two most common options have different strengths.
- Composite (tooth-colored) fillings blend in with your natural teeth and work well for small to medium cavities. They last about 7 years on average, though smaller fillings in people with good oral health can hold up for 10 years or more. National average cost runs $90 to $300 per filling.
- Amalgam (silver) fillings are more durable, lasting roughly 15 years on average. They’re less cosmetically appealing but hold up better on chewing surfaces of back teeth. They typically cost $50 to $200.
- Ceramic fillings are made of porcelain and can last 15 years or longer. They’re more expensive but resist staining better than composite.
- Gold fillings last the longest at 20 years or more but cost significantly more and require multiple visits.
- Glass ionomer fillings release fluoride, which offers some protective benefit, but they’re weaker and typically last only about 5 years. They’re best suited for small cavities near the gumline rather than on biting surfaces.
For larger areas of decay, a filling may not be enough. Crowns cover the entire visible portion of the tooth when too much structure has been lost. If decay reaches the inner nerve (pulp), a root canal removes the infected tissue and saves the tooth. Extraction is the last resort, reserved for teeth too damaged to repair.
Sealants Prevent Cavities Before They Start
Dental sealants are thin plastic coatings painted into the grooves of back teeth. Nine out of ten cavities form on these chewing surfaces, where bristles can’t reach the deepest pits and fissures. Sealants prevent 80% of cavities in back teeth over a two-year period, according to the CDC. They’re most commonly applied to children’s permanent molars shortly after they come in, but adults with deep grooves and no existing decay can benefit too.
What You Eat Matters More Than You Think
Cavity-causing bacteria feed on sugars and produce acid as a byproduct. Every time you eat something sugary or starchy, your mouth becomes acidic for about 20 to 30 minutes. Frequent snacking keeps that acid bath going almost continuously, giving your saliva no chance to repair damage between meals.
Reducing the frequency of sugar exposure matters more than the total amount. Sipping a soda over two hours does far more damage than drinking it in five minutes, because you’re restarting that acid clock with every sip. Sticky foods like dried fruit, gummy candies, and caramel cling to teeth and extend acid exposure even further.
Xylitol, a sugar alcohol found in some chewing gums and mints, actively fights cavities. Unlike regular sugar, cavity-causing bacteria can’t metabolize xylitol for energy. When they try, their growth stalls. Studies show that 6 to 10 grams of xylitol per day, spread across at least three doses, significantly reduces levels of the main cavity-causing bacteria in saliva. That translates to roughly 2 pieces of xylitol gum chewed 5 times per day. Look for products where xylitol is listed as the first ingredient, not a minor additive.
Do Natural Remedies Work?
Oil pulling, where you swish coconut or sesame oil in your mouth for 10 to 20 minutes, is one of the most commonly searched home remedies for cavities. The American Dental Association’s position is straightforward: no reliable scientific studies show that oil pulling reduces cavities, and the ADA does not recommend it as a dental hygiene practice.
Other popular suggestions like activated charcoal, turmeric paste, and clove oil have similar evidence gaps. Clove oil contains a natural numbing agent that can temporarily ease tooth pain, but it does nothing to reverse or stop decay. Rinsing with salt water can reduce bacteria counts temporarily but won’t remineralize damaged enamel in any meaningful way.
The distinction here is important. Some of these remedies might make your mouth feel cleaner or reduce discomfort, but none of them rebuild lost tooth structure. If you have an actual cavity, delaying real treatment while trying home remedies gives the decay more time to deepen, potentially turning a simple filling into a root canal.
Protecting Teeth You’ve Already Treated
Fillings don’t last forever, and the junction between a filling and natural tooth is especially vulnerable to new decay. Keeping filled teeth healthy means the same basics that prevent cavities in the first place: brushing twice daily with fluoride toothpaste, flossing to clear bacteria from between teeth where your brush can’t reach, and limiting how often you expose your teeth to sugar and acid throughout the day.
Saliva is your mouth’s built-in defense system. It washes away food particles, neutralizes acid, and delivers the minerals teeth need to repair early damage. Anything that reduces saliva flow, including certain medications for blood pressure, allergies, and depression, increases cavity risk substantially. Staying hydrated, chewing xylitol gum, and breathing through your nose rather than your mouth all help keep saliva flowing. If you notice persistent dry mouth, mention it at your next dental visit, because it changes how aggressively your teeth need to be protected.