Getting rid of a cavity depends entirely on how far it has progressed. If decay is still in its earliest stage, a white spot on the enamel, you can actually reverse it at home with the right products and habits. Once a physical hole has formed in the tooth, no home remedy will fix it. You’ll need a dentist to remove the decayed material and restore the tooth.
The One Stage You Can Reverse at Home
Tooth decay starts when bacteria in your mouth feed on sugars and produce lactic acid. When the acid drops the pH in your mouth below 5.5, it begins dissolving the minerals in your enamel, a process called demineralization. At this point, you might notice a chalky white spot on a tooth. That spot isn’t a hole yet. It’s weakened enamel that can still be rebuilt.
Fluoride toothpaste is the most proven way to reverse these early spots. Fluoride helps pull calcium and phosphate back into the weakened enamel, hardening it again. Toothpastes containing hydroxyapatite particles (the same mineral your teeth are made of) can also deposit directly onto demineralized surfaces and restore them. Some research shows the combination of hydroxyapatite and fluoride works even better than either alone.
Toothpastes with arginine, an amino acid, take a different approach. Certain bacteria in your mouth can convert arginine into alkaline byproducts that raise the pH of dental plaque, counteracting the acid that causes decay. In clinical studies, people who already had active cavities saw significantly more of this protective pH-raising activity after switching to an arginine-containing toothpaste. Products combining arginine with fluoride have been shown to be highly effective at slowing or stopping new cavities from forming.
The catch: this only works before a physical hole develops. Once the enamel breaks through, no toothpaste, rinse, or supplement will fill it back in.
What Happens Once a Hole Forms
Decay moves through your tooth in stages. After the reversible white-spot phase, continued acid exposure breaks the enamel surface open, and you may see the spot darken to brown. At this point you have a true cavity, a structural hole that traps food and bacteria and will only get deeper on its own.
If the decay reaches the dentin, the softer layer beneath enamel, it spreads faster and the tooth often becomes sensitive to hot, cold, or sweet foods. Left untreated further, the decay reaches the pulp, the inner tissue containing nerves and blood vessels. That’s when a simple cavity becomes a serious problem requiring a root canal or extraction.
How Dentists Treat a Cavity
For most cavities, the process is straightforward. Your dentist numbs the area, removes the decayed portion of the tooth with a drill or laser, and fills the space with a restorative material. The whole appointment typically takes 20 to 60 minutes depending on the size and location.
The two most common filling materials are composite resin (tooth-colored) and amalgam (silver-colored). Composite fillings last a median of about 11 years, while amalgam fillings tend to last over 16 years. Composite fillings fail most often because new decay forms around them, especially in people with inconsistent brushing habits. Amalgam fillings are more likely to fail from fracture. Most people today choose composite because it matches the tooth color, and aesthetic preference is the primary reason older amalgam fillings get replaced.
Cost varies by how much of the tooth is involved. For a composite filling in 2025, expect to pay roughly $90 to $150 for a small, single-surface cavity, $130 to $220 if two surfaces of the tooth are affected, and $180 to $300 for larger cavities covering three or more surfaces. Dental insurance typically covers a significant portion.
Silver Diamine Fluoride: A No-Drill Option
For people who can’t easily get a filling, whether due to age, anxiety, cost, or access, silver diamine fluoride (SDF) offers an alternative. It’s a liquid painted directly onto the cavity that kills decay-causing bacteria, stops mineral loss, and forms a hardened mineralized layer over the damaged surface. It won’t restore the tooth’s shape, but it can arrest the decay and prevent it from getting worse. SDF has been used since 1969, particularly for children’s baby teeth and root cavities in older adults. The major downside is cosmetic: it permanently stains the treated area black.
Home Remedies That Don’t Work
Oil pulling, the practice of swishing coconut or sesame oil in your mouth for 10 to 20 minutes, is one of the most commonly recommended “natural” cavity treatments online. Advocates claim it can treat tooth decay, heal bleeding gums, and even prevent heart disease. According to a review published in the British Dental Journal, there is no evidence that oil pulling can prevent or treat cavities, detoxify the body, or strengthen teeth. The same applies to charcoal toothpaste, baking soda pastes, and clove oil. These may freshen your breath or temporarily reduce bacteria counts, but none of them can rebuild lost tooth structure.
Signs a Cavity Has Become Urgent
Most cavities progress slowly enough that you can schedule a routine appointment. But if you develop a fever along with facial swelling, that combination suggests the decay has led to a tooth abscess, a pocket of infection at the root. Other warning signs include swollen lymph nodes under your jaw, pain that throbs without any trigger, and swelling in your cheek or neck. If the swelling makes it hard to breathe or swallow, that’s an emergency. The infection may have spread into your jaw, throat, or neck, and you should go to an emergency room rather than waiting for a dental appointment.
Keeping New Cavities From Forming
Once you’ve dealt with a cavity, the goal shifts to making sure you don’t get another one. The basics matter more than any specialty product: brush twice a day with fluoride toothpaste, floss daily to clear bacteria from between teeth where your brush can’t reach, and limit how often you snack on sugary or starchy foods throughout the day. Frequency matters more than quantity. Sipping a soda over two hours does more damage than drinking it in five minutes, because your mouth stays acidic for longer.
If you’re cavity-prone, a toothpaste containing hydroxyapatite or arginine alongside fluoride can give you an extra edge. Your dentist can also apply professional-strength fluoride varnishes at your regular checkups, which provide a concentrated dose directly to vulnerable areas. For people with deep grooves in their molars, dental sealants (a thin protective coating painted into those grooves) can cut the risk of decay on chewing surfaces significantly.