If you think you have a cavity, the single most important step is booking a dental appointment. A cavity won’t heal on its own, and the earlier it’s treated, the simpler and cheaper the fix. While you wait for your appointment, there are practical ways to manage any pain and protect the tooth from further damage.
How to Tell If It’s Actually a Cavity
Cavities don’t always announce themselves right away. In the earliest stage, all you might notice is a white spot on the tooth where minerals are starting to break down. At this point there’s no hole yet, and the process can sometimes be reversed with fluoride treatments before it becomes a true cavity.
Once decay breaks through the outer enamel, symptoms start showing up: sensitivity when you eat or drink something sweet, hot, or cold; a mild to sharp pain when you bite down; visible holes or pits in the tooth; or brown, black, or white stains on the surface. Some cavities sit between teeth where you can’t see them at all, which is one reason routine dental X-rays matter. Not every twinge means a cavity, but persistent sensitivity or visible discoloration is worth getting checked.
Managing Pain Before Your Appointment
If the tooth is bothering you while you wait to see a dentist, a few simple steps can help. Rinse your mouth with warm water and use floss to clear any food trapped around the tooth. An over-the-counter pain reliever like ibuprofen or acetaminophen can dull the ache. One important caution: don’t place aspirin directly against your gums, because it can burn the tissue.
A cold compress held against the outside of your cheek can also reduce pain and swelling. Numbing gels containing benzocaine are available over the counter, but use them sparingly, stick to the recommended dose, and avoid them entirely in children under two. These measures are temporary. They buy you comfort, not a cure.
What Happens at the Dentist
Your dentist will start with a visual exam and typically take X-rays to see how deep the decay goes. Some offices also use a small laser device that shines light onto the tooth surface to detect early decay without any poking or scraping. The goal is to figure out which stage of decay you’re dealing with, because that determines the treatment.
Tooth decay moves through a predictable progression. It starts in the hard outer enamel, then reaches the softer layer underneath called dentin. Decay moves faster through dentin because it’s less resistant to acid, and this is often when sensitivity ramps up. If it continues deeper, it hits the pulp, the innermost part of the tooth that contains nerves and blood vessels. That’s when real pain kicks in. Left even longer, bacteria can cause an infection that forms a pocket of pus called an abscess.
Fillings: The Most Common Fix
Most cavities caught at the enamel or dentin stage are treated with a filling. The process is straightforward: your dentist numbs the area with local anesthesia, removes the decayed portion of the tooth with a small drill or similar instrument, then fills the hole with a restorative material. The whole thing typically takes under an hour.
You’ll generally choose between two main filling materials. Composite resin is tooth-colored, blends in visually, and is hardened with a special curing light. It runs roughly $90 to $300 per filling on average. Amalgam (the traditional silver-colored option) is a mix of metals and tends to be cheaper, averaging $50 to $200. Glass ionomer is a third option that’s also tooth-colored and releases fluoride, though it’s less durable and typically used in lower-stress areas. Your dentist can help you weigh appearance, durability, and cost based on which tooth is affected.
When a Filling Isn’t Enough
If the cavity is large enough that there isn’t much healthy tooth structure left, a filling alone may not hold. In these cases, a crown (a cap that fits over the entire visible tooth) provides the structural support the tooth needs to handle the pressure of chewing. Crowns are also common after a tooth has cracked or when an old filling takes up more space than the remaining natural tooth.
When decay has reached the pulp and caused infection, a crown alone won’t solve the problem. Capping an infected tooth just traps bacteria inside, which leads to an abscess. This is where a root canal becomes necessary. Signs that decay has gone this far include a severe toothache while chewing, lingering sensitivity to hot or cold that doesn’t fade quickly, swelling in the gums or jaw, or a small bump on the gums near the affected tooth. During a root canal, the infected pulp tissue is removed, the inside of the tooth is cleaned and sealed, and a crown is usually placed on top afterward. It sounds intimidating, but the procedure is done under local anesthesia and most people compare the experience to getting a large filling.
What Happens If You Ignore It
Cavities don’t plateau. Decay is a bacterial process that keeps advancing through the tooth as long as the bacteria have something to feed on. A small cavity that could have been fixed with a simple filling can progress to the point where you need a root canal, a crown, or even an extraction. Each step up in treatment is more invasive, more time-consuming, and significantly more expensive.
Beyond the tooth itself, untreated cavities carry real health risks. An abscess from advanced decay can spread infection to the jaw, the surrounding tissues, or in rare but serious cases, other parts of the body. The CDC notes that untreated cavities can affect basic daily functions like eating, speaking, and concentrating. Pain from an untreated cavity also tends to worsen unpredictably, often flaring up at the worst possible time.
Preventing the Next One
Once your current cavity is treated, the same conditions that caused it can create new ones. The bacteria in your mouth feed on sugars and produce acid, which dissolves tooth enamel over time. Brushing twice a day with fluoride toothpaste and flossing daily removes the plaque where those bacteria thrive. Fluoride itself helps re-mineralize enamel in its earliest stages of breakdown, essentially patching weak spots before they become full cavities.
Limiting sugary and acidic foods and drinks reduces the amount of acid your teeth are exposed to throughout the day. Frequent snacking is particularly hard on teeth because it keeps acid levels elevated for longer periods. Drinking water after meals, chewing sugar-free gum to stimulate saliva, and keeping up with dental cleanings every six months all tilt the odds in your favor. If you’ve already had one cavity, you’re statistically more likely to develop another, so these habits aren’t optional extras. They’re the most practical thing you can do to avoid sitting in that dental chair again.