How Do I Know If I Have a Cavity?

Kaylee Wonder
Jun 11
3 min read

Cavities are one of the most common dental problems in the world, yet many people don't realize they have one until it's already causing pain. The good news? Your body often sends warning signals early. Knowing what to look (and feel) for can help you catch a cavity before it requires serious treatment.

What is a cavity, exactly?

A cavity, also called tooth decay or dental caries is a permanently damaged area on the hard surface of a tooth that develops into a tiny hole. Cavities form when bacteria in your mouth feed on sugars and starches, producing acids that slowly eat away at your tooth enamel. If left untreated, they can reach the inner layers of your tooth, leading to infection or tooth loss.

Common signs you might have a cavity

Cavities don't always hurt right away especially in the early stages. But here are the most common symptoms to watch for:

Tooth sensitivity: A sudden twinge when eating sweet, hot, or cold foods is one of the earliest warning signs.
Toothache or pain: Spontaneous pain, or pain when you bite down, is a sign that decay may have reached deeper layers of the tooth.
Visible pits or holes: Sometimes you can see a dark spot, pit, or small hole on the tooth's surface.
Staining on the tooth: White, brown, or black staining can indicate early decay, especially if the discoloration wasn't there before.
Pain when eating sweets: If sugary foods or drinks cause sharp pain in a specific tooth, that's a classic sign of cavity formation.
Pain when biting: Discomfort when you chew suggests decay may have gone deeper, possibly affecting the tooth's nerve.

Important: In the very early stages, cavities often have no symptoms at all. This is why regular dental checkups (typically every 6 months) are so important. X-rays can detect decay long before you feel it.

How cavities develop — stage by stage

Enamel erosion: Acid from bacteria begins to break down the outer enamel. White spots may appear. Usually painless and sometimes reversible with fluoride.
Enamel decay: The enamel breaks down further and a hole forms. Sensitivity to sweets or temperature may begin. A filling is typically all that's needed.
Dentin involvement: Decay reaches the softer dentin beneath enamel. Sensitivity increases noticeably. A filling is still typically effective.
Pulp affected: The decay reaches the innermost pulp where nerves and blood vessels live. This often causes significant pain and may require a root canal.
Abscess formation: An untreated infection spreads to surrounding tissues, causing swelling, severe pain, and possibly tooth loss. Immediate dental care is essential.

What should you do if you suspect a cavity?

The most important step is simple: call your dentist. Only a dental professional can properly diagnose a cavity through a physical exam and x-rays. The earlier you go, the simpler (and less expensive) the treatment will be.

Don't wait for the pain to get worse. Many people delay going to the dentist because the discomfort seems manageable. But cavities always progress, they don't heal on their own. What starts as a simple filling can become a root canal or extraction if ignored.

How to prevent cavities

Brush your teeth twice a day with fluoride toothpaste
Floss daily to remove food and plaque from between teeth
Limit sugary snacks and drinks, especially between meals
Drink plenty of water, especially fluoridated tap water
Visit your dentist regularly for cleanings and checkups
Ask about dental sealants if you or your child are prone to decay

Think you might have a cavity?

Don't wait! Early treatment is faster, easier, and more affordable. Book an appointment with Wonder Family Dental & Dentures today and let us take a look. Your smile is worth it!