You cannot remove a cavity at home once it has formed a hole in your tooth. Cavities are permanent structural damage to tooth enamel, and only a dentist can drill out the decayed material and restore the tooth with a filling. However, the very earliest stage of decay, before an actual hole forms, can sometimes be reversed with the right approach. Understanding where your tooth falls on that spectrum determines what happens next.
Early Decay Can Be Reversed Without a Dentist
Tooth decay doesn’t start as a hole. It begins as demineralization, where acids from plaque bacteria strip minerals from your enamel. At this stage, you might notice a white or discolored spot on the tooth. No hole exists yet, and no filling is needed.
This is the one window where you can intervene on your own. Fluoride toothpaste and fluoridated tap water help your saliva redeposit calcium and phosphate back into weakened enamel, essentially patching the damage before it becomes permanent. If you’re at higher risk for decay, your dentist can prescribe a stronger fluoride toothpaste or rinse. Products containing xylitol or hydroxyapatite are marketed for this purpose too, but the American Dental Association notes there isn’t currently enough evidence to suggest they work better than fluoride.
Once decay breaks through the enamel surface and creates an actual cavity, remineralization is no longer an option. The damage is irreversible, and the tooth needs professional treatment.
How Dentists Remove Cavities
The standard process is straightforward. Your dentist numbs the area with local anesthetic, uses a drill to remove all the decayed tooth material, then fills the cleaned-out space with a restorative material. The entire procedure typically takes 20 to 40 minutes per tooth, depending on the size of the cavity and the filling material used.
Some dental offices now offer laser cavity removal as an alternative to the traditional drill. Lasers use a focused light beam to cut away decay, producing less vibration and less pain. Several studies have found that lasers can allow patients to skip numbing anesthetic entirely, even in children. That said, there’s limited evidence showing lasers provide any long-term benefit to the tooth itself compared to a drill. They’re mainly an option for people with dental anxiety or sensitivity to vibration.
Filling Materials
The material your dentist uses to fill the cavity affects cost, appearance, and how long the restoration lasts.
- Composite resin is tooth-colored and can be closely matched to your natural teeth, making it the go-to choice for visible areas. It bonds directly to the tooth structure, and dentists often need to remove less healthy tooth material to place it. The tradeoff is durability: composite fillings last at least five years but wear down faster than other options, especially on chewing surfaces. They also cost more and take longer to place.
- Silver amalgam is a mix of mercury, silver, tin, zinc, and copper. It’s the most durable common option, lasting 10 to 15 years, and holds up well under heavy chewing forces. It’s also typically less expensive. The downsides are cosmetic: amalgam is visibly metallic and can give surrounding tooth structure a grayish tint over time. It also requires removing more healthy tooth to create a space large enough to hold the filling. About 1% of people have an allergic reaction to the mercury in amalgam.
- Porcelain (ceramic) fillings are the longest-lasting option, generally holding up for more than 15 years. They’re tooth-colored and resist staining well. They tend to be the most expensive choice and may require more than one visit.
Without insurance, a filling in the U.S. generally runs $200 to $335, though the price varies based on cavity size, the material used, and where you live.
When a Filling Isn’t Enough
Tooth decay progresses through distinct layers. Once it moves past the enamel into the softer dentin underneath, a filling may still work if caught early, but advanced dentin decay might need a crown instead. The real turning point is when decay reaches the pulp, the innermost layer containing nerves and blood vessels.
Pulp damage changes the equation entirely. At this stage, you’ll likely need a root canal rather than a simple filling. There are some telling signs that decay has reached this point: sharp pain triggered by hot or cold that lingers for 30 seconds or more after the trigger is removed, spontaneous pain that comes without any cause, pain that gets worse when you lie down or bend over, or extreme tenderness when you bite down. Over-the-counter pain relievers typically stop being effective at this stage.
If an infection develops and an abscess forms at the root, treatment becomes more urgent. An abscess involves rapid-onset pain, swelling, and pus formation. A root canal can often still save the tooth by removing the infection and sealing it, but in severe cases the tooth may need to be extracted entirely.
What Recovery Feels Like
After a standard filling, expect the most noticeable sensitivity in the first two days. Cold drinks, hot food, and biting pressure can all trigger brief discomfort. By days three to five, most people notice significant improvement. Shallow to moderate fillings typically feel completely normal within two weeks. Deeper fillings placed close to the pulp can take three to four weeks to fully settle.
One common issue worth knowing about: if your filled tooth hurts mainly when you chew, the filling may be sitting slightly too high and interfering with your bite. This is an easy fix. Your dentist can shave it down in a quick visit. Contact your dentist if chewing pain persists beyond the first few days, as a bite adjustment will likely solve it.
Preventing the Next Cavity
The same fluoride strategy that reverses early white spots also prevents new cavities from forming. Brushing twice daily with fluoride toothpaste, drinking fluoridated water, and flossing to remove plaque between teeth where cavities commonly start are the core habits. Limiting sugary and acidic foods reduces the acid attacks that kick off demineralization in the first place.
Regular dental checkups matter because early decay is often invisible to you. A dentist can spot demineralization at the white-spot stage, when it’s still reversible, and apply professional fluoride treatments to stop it from progressing into a cavity that needs drilling.