If you think you have a cavity, the most important step is to schedule a dental appointment, but there’s plenty you can do right now to slow things down and manage discomfort while you wait. Cavities don’t heal on their own once they’ve broken through the enamel, so the sooner you act, the simpler and cheaper the fix will be.
Confirm What You’re Seeing and Feeling
Cavities progress through distinct stages, and the signs change as they deepen. The earliest stage, demineralization, shows up as small white or chalky spots on the tooth surface. At this point there’s no hole yet, and the damage can actually be reversed with fluoride. If those white spots have turned light brown, you’re likely looking at enamel decay, where a visible hole has started to form.
Sensitivity is a key signal. If hot, cold, or sweet foods trigger a sharp zing in one specific tooth, decay may have reached the dentin, the softer layer beneath the enamel. You might also notice darker brown discoloration. Once decay hits the pulp (the innermost part of the tooth containing nerves), the pain becomes more persistent. Redness and swelling in the surrounding gum tissue often follow. A bad taste in your mouth or persistent bad breath can also point to active decay.
Not every dark spot is a cavity, and not every sensitive tooth means decay. Staining from coffee or tea can look similar, and sensitivity sometimes comes from receding gums or a cracked tooth. But if you’re noticing a combination of visual changes and pain triggers, it’s worth treating it as a probable cavity until a dentist can confirm.
What to Do Right Now
While you wait for your appointment, you can slow the decay and protect the tooth. The National Institute of Dental and Craniofacial Research notes that fluoride can prevent tooth decay from progressing and even reverse very early damage. Brush twice a day with a fluoride toothpaste, and if your tap water is fluoridated, drink it instead of bottled water that may lack fluoride.
Diet matters more than most people realize during this window. Every time you eat or drink something sugary, bacteria in your mouth produce acid that attacks the enamel for about 20 to 30 minutes afterward. Limiting between-meal snacks reduces the number of these acid attacks and gives your teeth a chance to repair themselves between exposures. Save sugary drinks, candy, and cookies for mealtimes rather than sipping or snacking throughout the day. Avoid eating or drinking anything sugary after your nighttime brushing, because saliva flow drops during sleep, leaving teeth more vulnerable.
Managing Pain Before Your Appointment
If the tooth is painful, over-the-counter pain relievers can help. The American Dental Association recommends combining ibuprofen and acetaminophen for dental pain. A common effective dose is 400 mg of ibuprofen (two standard pills) taken alongside 500 mg of acetaminophen. Taking them with food helps prevent stomach upset. Avoid alcohol while using either medication.
This combination won’t be appropriate for everyone. If you’re pregnant, have kidney or liver disease, take blood thinners, or have an allergy to either medication, talk to a pharmacist before taking them. For mild sensitivity rather than outright pain, a toothpaste designed for sensitive teeth can provide some relief within a few days of regular use.
What Happens at the Dentist
Your dentist will start with a visual exam, checking for discoloration and soft spots. Cavities on visible surfaces are relatively easy to spot, but decay between teeth, especially toward the back of your mouth, typically requires X-rays. Standard dental X-rays can only detect a cavity after roughly 30% of the enamel in one spot has been compromised, which is one reason regular checkups catch problems that you can’t feel yet.
If the dentist confirms a cavity, what happens next depends on how deep it goes. Early enamel-only decay might be treated with concentrated fluoride applications to remineralize the tooth, no drilling required. Once a hole has formed, you’ll need a filling. If the damage is extensive but the tooth’s structure is still mostly intact, an inlay or onlay (a partial covering) may be used instead. A tooth with severe structural loss will need a crown.
What a Filling Actually Involves
A standard filling appointment is straightforward. The dentist numbs the area, removes the decayed material, cleans the cavity, and fills it with a restorative material. The whole process, including the exam and any imaging, generally takes under an hour for a simple cavity.
Cost depends on the material and how many surfaces of the tooth are affected. A single-surface filling typically runs $150 to $300. With dental insurance, your out-of-pocket share often drops to $50 to $150. The most common material today is composite resin (tooth-colored), which averages around $191 per tooth. Amalgam (silver) fillings average about $160 and are extremely durable, though less popular for visible teeth. Porcelain fillings cost significantly more, around $1,150 per tooth, but blend seamlessly with natural enamel. A filling that covers two or three surfaces costs more because it requires additional material, time, and precision.
What Happens If You Wait Too Long
Cavities don’t plateau. They keep progressing, and each stage involves more pain, more complex treatment, and higher costs. Once bacteria eat through the enamel, they move into the dentin, which is softer and decays faster. From there, they can reach the pulp, where the tooth’s nerves live. When the pulp becomes infected, the nerves inside the tooth die, and the body’s immune system attacks the infection. Pus collects around the dying roots, forming a dental abscess.
An abscess is a serious infection. Symptoms include pain that radiates into the jaw or face, facial swelling, swollen lymph nodes in the neck, and sometimes fever. At this stage, a simple filling is no longer an option. You may need a root canal, a crown, or in the worst case, an extraction. These treatments cost several times more than a filling and involve significantly longer recovery. The infection can also spread beyond the tooth into the jawbone or bloodstream, which is a medical emergency.
The contrast is stark: a cavity caught early might cost $150 and take 30 minutes to fix. The same cavity ignored for months could require thousands of dollars in treatment and multiple appointments. If cost or anxiety is keeping you from making the call, many dental offices offer payment plans, and sedation options are widely available for patients who find dental work stressful.
Preventing the Next One
Once you’ve dealt with this cavity, the habits that slow decay now become your long-term prevention strategy. Brush with fluoride toothpaste twice daily, floss once a day to clean the surfaces between teeth where X-rays struggle to catch early decay, and keep sugary snacks and drinks to mealtimes. Regular dental checkups, typically every six months, let your dentist catch demineralization at the white-spot stage, when it can still be reversed without any drilling at all.