How Can You Spot a Cavity Between Your Teeth?

September 18, 2025

Dentist holdind tooth model, showing cavity

Cavities are one of the most common dental problems, but not all of them are easy to spot. Some form in the spaces between your teeth—known as interproximal cavities—where they can quietly grow without obvious signs. Because these areas are hard to see and clean, they’re particularly vulnerable to decay.

Here’s how to tell if you might have a cavity between your teeth and what you can do to prevent one.

What Causes Cavities Between Teeth?

Cavities develop when plaque—a sticky film of bacteria—builds up on your teeth and produces acids that erode enamel. The areas between teeth are especially prone to decay because food particles and bacteria can easily get trapped there. Without thorough brushing and flossing, these spaces become a prime spot for cavities to form.

Other risk factors include a high-sugar diet, dry mouth, and inconsistent dental checkups. Over time, even a small area of decay can spread deeper into the tooth, eventually reaching the dentin and causing pain or infection.

Common Signs of a Cavity Between Teeth

Because interproximal cavities start out hidden, they can be difficult to detect in their early stages. However, there are a few symptoms that may indicate something is wrong:

  • Sensitivity to hot, cold, or sweet foods
  • Pain when biting or chewing
  • A dull ache that comes and goes
  • Discoloration or dark spots near the gumline
  • Food consistently getting stuck between specific teeth

In many cases, though, cavities between teeth cause no noticeable symptoms until they’ve progressed. That’s why regular dental exams and X-rays are so important—your dentist can spot decay long before it causes discomfort.

How Dentists Detect Cavities Between Teeth

During your checkup, your dentist uses small dental tools to examine your enamel for soft spots or irregularities. However, because interproximal cavities are hidden, X-rays are usually the most effective way to detect them. Bitewing X-rays show the areas between teeth in detail, allowing your dentist to identify cavities early and treat them before they worsen.

If decay is found, treatment often involves removing the damaged area and filling the cavity to restore the tooth’s structure and function.

Preventing Cavities Between Teeth

The best way to prevent cavities between your teeth is to keep those spaces clean and healthy every day. That means:

  • Brushing twice a day with fluoride toothpaste
  • Flossing daily to remove trapped food and plaque
  • Rinsing with an antibacterial mouthwash
  • Limiting sugary snacks and beverages
  • Visiting your dentist regularly for cleanings and exams

Early detection and good oral hygiene can stop decay before it has a chance to develop.

A healthy smile starts with the care you give it every day—and a little prevention goes a long way toward avoiding hidden cavities.

About the Practice

Dr. Korte of White Oak Dental provides comprehensive restorative and preventive dental care in Chaska, helping patients maintain strong, healthy smiles. Our skilled team offers advanced diagnostics, including digital X-rays, to detect cavities between teeth early. Whether you need a simple filling or more extensive restorative treatment, Dr. Korte and the team are committed to personalized, high-quality care for every patient.

Call us at (952) 448-2868 or request an appointment online.