Tooth decay treatment depends entirely on how far the damage has progressed. Early decay that hasn’t broken through the enamel surface can actually be reversed without a drill. Once a cavity forms, treatment shifts to removing the damaged tissue and restoring the tooth with a filling, crown, or in severe cases, a root canal or extraction.
Reversing Early Decay Before It Becomes a Cavity
Not all tooth decay requires drilling. In its earliest stage, decay appears as a white or brown spot on the enamel where minerals have started to leach out. The surface is still intact, just weakened. At this point, the goal is remineralization: coaxing calcium and phosphate back into the enamel to rebuild what acid has dissolved.
Fluoride is the primary tool for this. When fluoride contacts weakened enamel, it pulls calcium and phosphate ions onto the tooth surface and forms a compound called fluorapatite. This rebuilt layer is actually more resistant to acid than the original enamel. Your dentist may apply a concentrated fluoride varnish in the office, and you’ll typically be told to use fluoride toothpaste or a prescription-strength fluoride rinse at home. The key is catching decay at this noncavitated stage, which is one reason routine checkups matter. Once the surface breaks down and a true cavity forms, no amount of fluoride can grow the tooth back.
Fillings for Small to Moderate Cavities
When decay eats through the enamel and creates an actual hole, the standard treatment is a filling. Your dentist numbs the area, removes the decayed tissue with a drill (or occasionally a laser), and fills the space with a restorative material. The two most common options are composite resin and amalgam.
Composite resin fillings are tooth-colored and blend in visually. They work well for small to medium cavities on both front and back teeth and typically last 5 to 10 years. Amalgam (silver) fillings are stronger and more resistant to the chewing pressure on molars. They tend to last 10 to 15 years or longer, making them a good choice for large cavities in back teeth where durability matters more than appearance. Cost-wise, amalgam fillings run about $50 to $150 for one to two teeth, while composite fillings cost $90 to $250.
After a filling, you can expect the numbness to wear off within a few hours. Some sensitivity to hot, cold, or pressure near the filled tooth is normal for a few days. You can brush and floss normally but should be gentle around the area while it settles.
Silver Diamine Fluoride: A No-Drill Option
Silver diamine fluoride (SDF) is a liquid that can actually arrest cavities that have already formed, stopping them from getting worse without any drilling. A dentist simply paints it onto the decayed area. The American Dental Association recommends applying a 38% SDF solution twice a year for advanced cavitated lesions on both baby teeth and permanent teeth. For root cavities in adults, SDF prevented new decay at rates 72% higher than placebo treatments.
The trade-off is cosmetic: SDF permanently stains the decayed area black. It also doesn’t restore the tooth’s shape or structure the way a filling does. It’s most useful when traditional treatment isn’t practical, such as for young children who can’t sit through a procedure, older adults with limited mobility, or anyone who has difficulty accessing dental care. Think of it as a way to hit pause on a cavity rather than a permanent fix.
Crowns for Extensive Damage
When a cavity is too large for a filling to hold, or when decay has weakened most of the tooth’s structure, the next step is a crown. A crown is a custom-made cap that fits over the remaining tooth, restoring its shape, strength, and function. The process usually takes two visits: one to prepare the tooth and take impressions, and another to cement the permanent crown in place. Some offices with milling technology can do it in a single visit.
The most common crown materials are ceramic (porcelain), porcelain fused to metal, and zirconia. Zirconia crowns are the strongest option, with survival rates exceeding 95% after 10 years. Porcelain-fused-to-metal crowns have 10-year survival rates of 94 to 96% and cost between $600 and $1,800 per tooth. All-ceramic crowns offer the most natural look and run $800 to $2,000, while metal crowns cost $500 to $1,500.
Root Canals When Decay Reaches the Nerve
If decay penetrates deep enough to infect the pulp (the soft tissue inside the tooth containing nerves and blood vessels), a filling or crown alone won’t solve the problem. You’ll likely experience significant pain, sensitivity to temperature, or swelling. A root canal removes the infected pulp, cleans and disinfects the interior channels of the tooth, then seals them. The tooth is preserved but is no longer “alive” in the sense that it has no nerve supply.
After the procedure, you’ll feel some tenderness for a few days as the area heals, along with possible jaw soreness from keeping your mouth open during treatment. Over-the-counter pain relievers usually handle this well. You should avoid chewing on hard foods or biting down heavily with the treated tooth until your dentist clears you. Most root canal teeth eventually need a crown placed on top, since the tooth becomes more brittle without its internal blood supply.
Extraction and Replacement
When decay has destroyed too much of the tooth for it to be saved, extraction is the final option. A simple extraction, where the tooth is visible and accessible, costs $75 to $250. Surgical extractions for teeth that are broken below the gumline or otherwise complicated run $180 to $550.
After extraction, you’re left with a gap that can cause neighboring teeth to shift over time and make chewing harder. The two main replacement options are dental implants and bridges. An implant is a titanium post surgically placed in the jawbone, topped with an artificial crown. Implants have a 10-year survival rate of about 95% and function like a natural tooth. A fixed bridge spans the gap by anchoring an artificial tooth to the teeth on either side, with 15-year survival rates of 70 to 85%. Bridges are less invasive and less expensive upfront, but they require filing down healthy neighboring teeth and don’t last as long.
Laser Treatment as an Alternative to the Drill
Some dental offices now use lasers to remove decayed tissue instead of a traditional drill. The practical benefit for patients is comfort: people treated with lasers are significantly less likely to need anesthesia, and they report noticeably less pain during the procedure. The restored tooth holds up just as well afterward, with no difference in filling survival or nerve health compared to conventional drilling.
The downside is time. Laser cavity preparation takes meaningfully longer than using a drill. Not every cavity is a good candidate for laser treatment, and availability varies by practice. If dental anxiety or needle phobia has kept you from getting treatment, it’s worth asking whether your dentist offers this option.
What Drives the Cost of Treatment
The financial reality of decay treatment is straightforward: the earlier you catch it, the cheaper it is. A fluoride varnish at a routine cleaning costs very little. A composite filling averages under $250. But let that same cavity grow until it needs a crown, and you’re looking at $800 to $2,000. Add a root canal beforehand and the total climbs further. An implant to replace a tooth that couldn’t be saved is the most expensive path of all. Dental insurance typically covers a portion of fillings and crowns but may have waiting periods or annual caps that don’t fully cover major work. The most cost-effective strategy is also the simplest: regular checkups that catch decay while it’s still small enough to treat inexpensively, or even reverse entirely.