Once a cavity has broken through your tooth’s enamel and created an actual hole, the only way to remove it is to have a dentist cut out the decayed tissue and fill the space. There is no home remedy, food, or supplement that can reverse a cavity once it has progressed to that point. However, very early-stage decay, before a hole forms, can sometimes be reversed through remineralization. Understanding the difference between these two situations is the key to knowing what your options actually are.
Why Cavities Can’t Be Removed at Home
A cavity forms when bacteria in your mouth feed on sugars and produce acids. When the pH in your mouth drops below about 5.5, those acids start dissolving the mineral crystals that make up your enamel. If this happens often enough, and your teeth don’t get a chance to recover between acid attacks, the enamel breaks down and a hole forms. Once that structural damage exists, no amount of brushing, oil pulling, or dietary change can rebuild solid tooth structure. The decay will continue spreading deeper into the tooth unless it’s physically removed.
What Happens During a Filling
The most common way dentists remove cavities is with a traditional rotary drill, using diamond or tungsten carbide tips to cut away the decayed tissue. It’s been the standard approach for decades and remains the most widely used technique worldwide. You’ll typically receive a local anesthetic like lidocaine, injected near the tooth, which numbs the area for the duration of the procedure. Most simple fillings take 20 to 60 minutes.
Laser dentistry is a newer alternative. Instead of a drill, a focused light beam heats the water inside the decayed tissue, causing it to break apart. A Cochrane review comparing the two methods found that lasers and drills were equally effective at removing decay. The real difference was comfort: patients treated with lasers reported significantly less pain, and children treated with lasers were 75% less likely to need anesthesia. That said, the overall quality of evidence was rated low, and lasers aren’t available in every dental office.
For people with dental anxiety, sedation is also an option. Mild sedation keeps you awake but relaxed, moderate sedation may cause you to doze off, and deep sedation puts you nearly to sleep while still breathing on your own. Your dentist can discuss which level makes sense for your situation.
Filling Materials Compared
After the decay is removed, the dentist fills the space to restore the tooth’s shape and function. The two most common materials are amalgam (the silver-colored filling) and composite resin (tooth-colored). Each has trade-offs.
Amalgam is durable and inexpensive, which is why it remains widely used in many countries. Composite resin looks more natural since it matches your tooth color, but a Cochrane review found that composite fillings had nearly double the failure rate of amalgam fillings. Composites also carried a significantly higher risk of secondary cavities forming around the edges of the restoration. On the other hand, composite fillings were no more likely to fracture than amalgam. For front teeth or visible areas, most people prefer the cosmetic advantage of composite. For back teeth that take heavy chewing force, the durability question becomes more relevant.
Ceramic and porcelain options also exist, typically as inlays or onlays for larger restorations. These are more expensive but offer both durability and a natural appearance.
Stopping Cavities Without Drilling
Silver diamine fluoride (SDF) is a liquid that a dentist paints directly onto a cavity to stop it from growing. It doesn’t remove the decay or restore the tooth’s shape, but it can arrest the progression of the cavity entirely. The FDA designated it a breakthrough therapy for cavity arrest in both children and adults. The American Dental Association recommends 38% SDF solution applied twice a year to arrest advanced cavitated lesions on both primary and permanent teeth.
SDF is particularly useful in specific circumstances: young children who can’t sit through a drilling procedure, older adults with root cavities, people with special needs, and anyone who can’t safely undergo general anesthesia. For root cavities in adults, studies have found SDF prevents new root decay at rates 72% higher than placebo. The main drawback is cosmetic. SDF permanently stains the treated area black, which makes it a poor choice for visible front teeth but a practical option for back teeth or baby teeth that will eventually fall out.
Reversing Early Decay Before It Becomes a Cavity
There is one stage where you can intervene without a dentist’s drill. When decay is still in the “white spot” phase, meaning minerals have started leaching out of the enamel but no hole has formed yet, the process can be reversed through remineralization. Your dentist might call these incipient or initial caries lesions.
Fluoride is the most established remineralization agent. It helps rebuild the mineral structure of weakened enamel, though lab studies show it tends to remineralize primarily the outer surface of the lesion. Hydroxyapatite, a synthetic version of the mineral your teeth are naturally made of, works through a different mechanism. It fills the tiny pores in demineralized enamel and acts as a scaffold for new mineral growth. In a controlled study, both fluoride gel and hydroxyapatite gel achieved roughly 40% remineralization of early lesions, with no significant difference between them. The hydroxyapatite did produce more even mineral recovery throughout the full depth of the lesion, while fluoride concentrated its effect near the surface.
The critical point: remineralization only works on decay that hasn’t yet become an actual cavity. Once there’s a physical hole in the tooth, these approaches can’t fix it.
Preventing New Cavities From Forming
The frequency of sugar exposure matters more than the total amount. Every time you eat or drink something sugary, the bacteria in your mouth produce acid for roughly 20 to 30 minutes. Sipping a soda over two hours creates a much longer acid attack than drinking it in five minutes. Reducing snacking frequency gives your saliva time to neutralize acids and begin repairing minor mineral loss naturally.
Xylitol, a sugar alcohol found in some gums and mints, has a specific anti-cavity effect. It reduces populations of the primary cavity-causing bacteria and cuts their acid production. A meta-analysis found the effective dose is 5 to 10 grams per day, consumed three to five times daily after meals. Below three times a day (less than about 3.4 grams), no cavity prevention benefit was observed. Products made with 100% xylitol as the sweetener, rather than a blend, showed the strongest results.
Fluoride toothpaste remains the single most effective daily prevention tool. Brushing twice a day with fluoride toothpaste and flossing to disrupt the bacterial film between teeth addresses both the chemical and biological sides of cavity formation. If you’re cavity-prone, your dentist may recommend prescription-strength fluoride toothpaste or professional fluoride treatments to give your enamel extra protection between visits.