The simple answer
A cavity can look and feel different from one person to another. Some cavities do not cause noticeable symptoms at first. Others may be linked with sensitivity, tooth pain, or visible changes on a tooth.
A symptom or spot does not prove that you have a cavity. Tooth pain, dark areas, sensitivity, and rough spots can have more than one cause. A dentist needs to examine the tooth to determine what is happening.
What a cavity is
A cavity is a damaged area of a tooth caused by tooth decay. Tooth decay happens when bacteria in plaque use sugars and starches to make acids that can weaken the tooth’s hard outer layer over time.
If that process continues, the enamel can break down and a hole can form in the tooth.
What a cavity can look like
A cavity is not always obvious in a mirror. Early tooth decay may not be visible to you, especially if it is between teeth or in a groove on a back tooth.
When visible changes are present, they may include:
- White spots on a tooth.
- Brown or black spots.
- A rough area or a hole.
- A change around the edge of an existing filling.
These changes are possible signs, not a diagnosis. A dark spot, for example, is not always active decay, and a cavity can be present even when you do not see anything unusual.
What a cavity can feel like
Cavities may not cause pain at first.
As decay progresses, some people notice:
- Toothache or ongoing tooth pain.
- Sharp sensitivity to cold, hot, or sweet foods and drinks.
These symptoms can have more than one cause. Symptoms alone cannot tell you which one is present.
Why a cavity can be “silent”
A cavity can develop before it causes pain. That is one reason regular dental checkups can be useful even when your mouth feels normal.
A dental examination can help a dentist look for problems that are difficult to see or feel on your own.
What not to do
Avoid trying to test a tooth repeatedly with cold drinks, sweets, or hard foods to see whether it still hurts.
Also avoid assuming that a symptom will resolve on its own simply because it comes and goes. If a tooth is bothering you, a dental professional can help determine whether it needs evaluation.
When to contact a dentist
Contact a dentist if you have tooth pain, sharp sensitivity when eating or drinking, a visible hole or new spot on a tooth, or a problem that keeps returning.
Contact a dental office sooner if you have swelling in or around your mouth, severe pain, fever, a broken tooth, or a loose tooth.
Seek emergency medical care now if swelling in your mouth or neck makes it difficult to breathe, swallow, or speak.
These signs can have different causes. A dental professional can assess the tooth and advise on the appropriate next step.
Takeaway
Cavities can be easy to miss early on, and they do not always hurt. Possible signs include sensitivity, pain, visible spots, or a hole in a tooth, but none of those signs can confirm a cavity by themselves.
If something looks or feels different, a dental exam is the clearest way to understand what is going on.
Sources
- Tooth decay — NHS
- Cavities — MouthHealthy / American Dental Association
- Toothache — NHS