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Home Patient Info Blog What to Do When a Cavity Begins to Hurt

What to Do When a Cavity Begins to Hurt


Posted on 2/2/2026 by Jerome Riddle DDS Office
A dentist wearing a mask consulting a female patient, using a tablet to discuss her dental health during an examination.Uh oh! You've got a toothache, and it's got you worried. That throbbing pain could mean you have a cavity. Let's talk about what happens when a cavity starts causing pain and, most importantly, what steps you should take.

Recognizing the Pain


Not all cavities hurt at first. In fact, often you won't feel anything at all when a cavity is small. Pain usually starts when the decay has reached the dentin, the layer of the tooth underneath the hard enamel. This dentin has tiny tubes that lead to the nerve. When the cavity gets to this point, you might experience:

•  Sensitivity to hot, cold, or sweet foods and drinks
•  Sharp pain when biting down
•  A constant, dull ache
•  Pain that comes and goes

It's important to pay attention to these signals. Ignoring the pain won't make it go away; it will likely get worse as the cavity gets bigger.

Immediate Relief


While you should schedule an appointment with your dentist ASAP, here are a few things you can do at home to manage the pain:

•  Rinse with warm salt water: This can help soothe the area and reduce inflammation. Mix a teaspoon of salt in a glass of warm water and rinse for 30 seconds.
•  Over-the-counter pain relievers: Medications like ibuprofen or acetaminophen can help reduce pain and inflammation. Follow the instructions on the label.
•  Cold compress: Applying a cold compress to the outside of your cheek can numb the area and reduce swelling.
•  Avoid irritating foods: Stay away from sugary, acidic, or hard foods that can make the pain worse.

These are temporary fixes. Don't rely on them as a long-term solution.

The Dentist's Role


When you see your dentist, they will examine your mouth to determine the extent of the cavity. This may involve taking X-rays to see how far the decay has spread.

Based on their examination, your dentist will recommend the best course of action. Often, this will involve removing the decayed portion of the tooth and filling it with a material like composite resin or amalgam. This process is part of restoration dentistry, which aims to repair and restore damaged teeth to their proper function and appearance.

In some cases, if the cavity is very large and has reached the nerve of the tooth, a root canal may be necessary. This involves removing the infected nerve tissue and sealing the tooth to prevent further infection.

Prevention is Key


The best way to deal with a painful cavity is to prevent it from happening in the first place. Good oral care is essential. Here's what you can do:

•  Brush your teeth twice a day: Use fluoride toothpaste and brush for at least two minutes each time.
•  Floss daily: Flossing removes plaque and food particles from between your teeth, where your toothbrush can't reach.
•  Limit sugary foods and drinks: Sugar feeds the bacteria in your mouth that cause cavities.
•  Regular dental checkups: Your dentist can detect cavities early, even before they cause pain. They can also provide professional cleanings to remove plaque and tartar.

Don't ignore tooth pain! It's your body's way of telling you something is wrong. Early detection and treatment are key to keeping your smile healthy and pain-free. Remember that proactive oral care is your best defense.

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