Cavities and Tooth Decay

A cavity is a hole in a tooth caused by tooth decay and the gradual breakdown of enamel by acid-producing bacteria. It's one of the most common dental problems at any age, and it doesn't reverse on its own once a true hole has formed. Ocotillo Trails Family Dentistry helps patients in San Tan Valley, Gilbert, and Mesa catch and treat tooth decay early, before it becomes a bigger problem.

San Tan Valley (480) 457-1977
Gilbert (480) 963-9900
Mesa (480) 830-3344

Cavity vs. Tooth Decay: What's the Difference?

These terms are often used interchangeably, and for good reason: a cavity is simply what tooth decay looks like once it’s progressed far enough to create a hole.

Tooth decay describes the ongoing process—acid gradually wears down the tooth. A cavity is the visible result of that process.

That’s why treating tooth decay early, before a cavity fully forms, can sometimes mean avoiding a filling altogether.

Baby Bottle Tooth Decay

Baby bottle tooth decay is caused by sugary substances in breast milk and some juices, which combine with saliva to form pools inside the baby’s mouth.

If left untreated, this can lead to premature decay of your baby’s future primary teeth, which can later hamper the proper formation of permanent teeth.

One of the best ways to avoid baby bottle tooth decay is to not allow your baby to nurse on a bottle while going to sleep. Encouraging your toddler to drink from a cup as early as possible will also help stave off the problems associated with baby bottle tooth decay.

How Tooth Decay Develops

Tooth decay develops through a fairly predictable process.

1–2. Plaque and Acid

Plaque forms. A sticky film of bacteria builds up on your teeth, especially after eating sugary or starchy foods.

Bacteria produce acid. The bacteria in plaque feed on sugar and starch and release acid as a byproduct.

3–4. Enamel Breakdown and Spread

Acid wears down enamel. Over time, this acid erodes the tooth’s hard outer layer, creating small openings that grow into cavities if untreated.

Decay spreads inward. Left alone, decay can progress from enamel into the softer dentin layer beneath it, and eventually to the tooth’s inner pulp, where the nerve lives.

Risk Factors

Certain things make cavities more likely:

Frequent snacking or sipping sugary or acidic drinks throughout the day
Not brushing and flossing consistently
Dry mouth, which reduces saliva’s natural protective effect
Worn or aging fillings and dental work
Acid reflux (GERD), which exposes teeth to stomach acid
A history of purging behaviors, which similarly exposes teeth to stomach acid
Age: Cavities are especially common in children and teens, and risk rises again in older adults due to gum recession and dry mouth from medications
Not getting enough fluoride

Symptoms and Stages of Tooth Decay

Early tooth decay often causes no symptoms at all, which is why regular checkups matter. As decay progresses, it generally follows a few recognizable stages:

Early demineralization: Small white or chalky spots appear on the enamel; often no pain yet
Enamel breakdown: A visible hole may form; spots can turn light brown
Dentin decay: Decay reaches the softer layer beneath enamel; sensitivity to hot, cold, or sweets often begins here

Later Stages and Warning Signs

Pulp involvement: Decay reaches the tooth’s nerve; this stage usually causes real pain, along with possible gum swelling
Abscess: Untreated decay can lead to a tooth abscess, a more serious infection that needs prompt treatment

Common symptoms: Toothache, sensitivity to hot, cold, or sweets, visible holes or pits, and brown, black, or white staining on a tooth.

What Happens If Left Untreated

Tooth decay doesn’t reverse or resolve on its own once a true cavity has formed. Left untreated, it continues to spread deeper into the tooth, which can eventually lead to a painful tooth abscess, damage that requires a root canal or extraction instead of a simple filling, and in some cases tooth loss. Catching decay early is almost always simpler and less invasive than waiting.

How It's Diagnosed

Your dentist can usually identify cavities during a routine exam by checking for soft spots, visible holes, and staining, and probing the tooth’s surface. Dental X-rays are commonly used as well, since they can reveal decay between teeth or beneath the surface before it’s visible to the eye.

Treatment Options

1. Fluoride Treatment

For very early decay, professional-strength fluoride can sometimes remineralize enamel before a hole fully forms.

2. Fillings

Once a cavity has formed, the decayed portion is removed and the tooth is restored with a tooth-colored or other filling material.

3. Crowns

For more extensive decay, a crown may be needed to protect and restore the tooth.

4. Root Canal Therapy

When decay reaches the tooth’s inner pulp, a root canal removes the affected tissue and saves the natural tooth.

5. Extraction

If a tooth is too damaged to restore, removal may be necessary, sometimes followed by a bridge or implant to replace it.

Prevention and Home Care

Daily care and regular dental visits can reduce the risk of cavities.

Can Help Prevent Cavities

Brush twice a day with fluoride toothpaste, and floss daily
Limit snacking and sipping sugary or acidic drinks throughout the day
Drink fluoridated tap water when possible
Ask your dentist about dental sealants, especially for children
Keep up with regular dental checkups and cleanings

Can Cavities Be Reversed Naturally?

The very earliest stage of decay—before an actual hole forms—can sometimes be remineralized with fluoride and improved oral hygiene.

Once a true cavity exists, no natural remedy reverses it; it needs a filling or other professional treatment. Waiting and hoping a hole will heal on its own typically allows the decay to spread further.

How We Treat Cavities

Most cavities are treated with a straightforward filling, especially when caught early. If decay has progressed further, our team can talk you through whether a crown or root canal therapy makes more sense for saving the tooth. Our General & Preventive Dentistry team also offers fluoride treatments and sealants to help prevent new cavities from forming.

Medically Reviewed Information

Medically reviewed by Dr. Matthew Roper, DDS. Last updated September 17, 2026.

Dr. Roper is a licensed general dentist who earned his Doctorate of Dental Medicine from A.T. Still University in Mesa.

This information is for educational purposes and does not replace a professional diagnosis.

Frequently Asked Questions

Can a cavity heal on its own?

Only in the very earliest stage, before an actual hole has formed. At that point, fluoride and improved oral hygiene can sometimes remineralize the enamel. Once a true cavity exists, it needs professional treatment and won’t close up naturally.

Are cavities contagious?

Not directly, but the bacteria that cause them can be passed between people through sharing utensils or kissing, for example. That bacteria can then contribute to tooth decay in the other person over time.

What's the best toothpaste for preventing cavities?

A toothpaste containing fluoride is the most important factor, since fluoride helps strengthen enamel and can reverse very early decay. Your dentist can recommend a specific option if you’re especially prone to cavities.

What happens if a cavity is left untreated?

It continues to grow and spread deeper into the tooth, which can eventually lead to significant pain, a tooth abscess, or the need for a root canal or extraction instead of a simple filling.

Are cavities more common in older adults and seniors?

Yes, cavity risk actually rises again later in life, often due to gum recession—which exposes tooth roots to decay—and dry mouth caused by certain medications.

Neighborhoods We Serve

Ocotillo Trails Family Dentistry is proud to welcome patients from San Tan Valley and the surrounding communities, including:

Driving Directions to Our San Tan Valley Dental Office

Visiting Ocotillo Trails Family Dentistry for cavities or tooth decay? Find us at 40815 N Ironwood Rd #102, San Tan Valley, AZ 85140. Travel along N Ironwood Road toward E Ocotillo Road, enter the property, and continue to Suite 102.