Cavities: What They Are and How to Avoid Them
Medically Reviewed by Carolyn Jovanovic, DDS on July 27, 2026
A cavity is a small hole in a tooth that forms when acid from bacteria wears away the tooth’s hard outer enamel. Left alone, that hole grows larger and can reach the sensitive inner layers of the tooth, leading to pain, infection, and eventually tooth loss. The good news is that cavities are largely preventable with consistent brushing, flossing, a balanced diet, and regular dental visits, and when one does form, modern treatments can restore the tooth’s shape and function.
At Montgomery Park Dental, we see cavities at every stage, from the first faint white spot to a tooth that needs a root canal, and we build our general dentistry care in Conroe, Texas, around catching decay early. This guide walks through what causes cavities, who is most likely to get them, how to spot the warning signs, and what your options look like if a cavity does need treatment.
What Is a Cavity?
Cavities, also called dental caries or tooth decay, are permanent damage to the surface of a tooth. They start when plaque, a sticky film of bacteria, food particles, and saliva, builds up on the teeth. The bacteria in plaque feed on sugars and starches and produce acid as a byproduct, and that acid slowly dissolves the minerals in the tooth’s enamel. Once the enamel is worn through, decay can spread into the softer dentin layer underneath and, if it goes untreated long enough, reach the nerve and blood vessels at the center of the tooth. Cavities most often form on the chewing surfaces of the back teeth, in the tight spaces between teeth, and along the gumline, where plaque tends to collect and is easiest to miss when brushing.
Cavities can affect anyone with teeth, from toddlers to older adults, though they tend to show up most often in children and teenagers. Children’s teeth have thinner enamel and are still developing, and younger patients are still building the brushing and flossing habits that keep decay in check. Adults are not immune, either, particularly as gums recede with age and expose the softer root surface of the tooth to plaque.
What Causes Cavities?
Cavities form through a straightforward but continuous process. Every time you eat or drink something with sugar or starch, bacteria in your mouth use it as fuel and release acid as a result. That acid pulls minerals out of your enamel in a process called demineralization. Your saliva works to counter this by redepositing minerals, but if acid attacks happen too often, such as with frequent snacking or sipping sugary drinks throughout the day, the tooth loses more minerals than it can replace.
Over time, this imbalance wears a small opening into the enamel. Left alone, that opening deepens into the dentin, the softer layer beneath the enamel, where decay tends to spread faster and often brings on sensitivity. The same bacteria and acid can eventually reach the pulp at the center of the tooth, which contains the nerves and blood vessels, at which point pain and infection become far more likely. Catching a cavity early, ideally at the enamel stage, is what allows for simpler, less invasive treatment.
Who Is Most at Risk for Cavities?
While anyone with teeth can develop a cavity, certain factors raise the odds. Diet plays a major role: frequent snacking, sipping sugary or acidic drinks, and eating foods that cling to the teeth all give bacteria more opportunities to produce acid. Dry mouth is another common factor, since saliva helps rinse away food particles and neutralize acid, and some medications and medical conditions reduce saliva flow. Deep grooves in the back molars, receding gums that expose tooth roots, and a personal or family history of cavities can also increase risk.
Age matters too. Children and teenagers are more prone to cavities because their enamel is still maturing and their brushing habits are still developing, which is part of why our family dentistry visits put extra focus on prevention for younger patients. Older adults face a different set of risk factors, including gum recession and a higher likelihood of dry mouth from certain medications. Whatever your age, consistent oral hygiene and regular dental checkups remain the most reliable way to manage that risk.
How Can You Avoid Cavities?
There are several everyday habits that make the biggest difference in preventing cavities, and none of them require anything beyond a solid routine and regular checkups. We recommend that patients focus on the following:
- Brushing twice a day with a fluoride toothpaste
- Flossing once a day to clear plaque between teeth
- Eating a balanced diet and limiting sugary snacks and drinks
- Visiting your dentist regularly for exams, dental sealants where appropriate, and professional cleanings
- Asking about fluoride treatments if you or your child are at higher risk
If a cavity does form despite these habits, your dentist will typically recommend a filling to restore the tooth’s shape and function. Dentists commonly use composite, amalgam, gold, or porcelain materials, and the right choice depends on the size and location of the cavity along with your own preferences.
What Are the Symptoms of a Cavity?
The symptoms of a cavity can vary depending on how severe the hole is. Some common symptoms include:
- Toothache
- Sensitivity to hot or cold temperatures
- Visible holes or pits in the teeth
- Pain when chewing or biting down
- Bad breath
- White or dark spots on the tooth's surface
If you notice any of these signs, especially ongoing sensitivity or a visible hole, it is worth having your dentist take a look as soon as possible so we can diagnose the problem and recommend treatment before it progresses. Not all sensitivity points to a cavity, and our overview of tooth sensitivity causes and solutions can help you understand when it is something to watch and when it needs an appointment.
Are There Any Home Remedies for Cavities?
There is no conclusive evidence that home remedies can treat or reverse an existing cavity. Some people believe products such as baking soda or diluted apple cider vinegar can help remineralize enamel and reduce risk, but the scientific support for these claims is limited, and using acidic rinses too often can work against your enamel instead. If you want to try a natural addition to your routine, talk with your dentist first, since some home remedies can interact with other dental treatments.
Cavities are common, but they respond best to proven prevention and, when needed, professional treatment rather than to home remedies alone. If you think you may have a cavity, it is best to schedule an exam rather than wait and see.
What Happens if You Don't Treat a Cavity?
An untreated cavity does not stay the same size. As decay works past the enamel into the dentin, it tends to spread faster and can bring on new sensitivity or a dull, persistent ache. Left alone long enough, the bacteria and acid eventually reach the pulp at the center of the tooth, where the nerves and blood vessels live, and that is when an infection becomes far more likely.
A dental infection can cause swelling, fever, and pain that radiates into the jaw or face, and in some cases it can spread to the surrounding tissue if it goes unaddressed. At that stage, an infected tooth may need root canal treatment or, if too much structure has been lost, extraction. Catching a cavity well before it reaches this point is almost always simpler, faster, and more comfortable than waiting for symptoms to force the issue.
How Are Cavities Diagnosed and Treated?
Diagnosing a cavity starts with a visual exam and gentle probing to check for soft spots on the enamel, along with dental X-rays that let your dentist see decay between teeth or below the surface that is not visible to the eye. At Montgomery Park Dental, our exams rely on advanced diagnostic technology to help catch a cavity as early as possible, often before it causes any discomfort.
Once we know the size and location of the decay, treatment depends on how far it has progressed. A small cavity caught early often needs nothing more than a dental filling, which removes the decayed portion of the tooth and replaces it with a durable material such as composite resin or amalgam. Larger cavities may need a crown to protect what remains of the natural tooth structure.
If decay has reached the pulp, the innermost layer that holds the tooth’s nerves and blood vessels, a root canal is usually the recommended path. This procedure removes the affected pulp and seals the tooth to stop the infection from spreading. In cases where a tooth is too damaged to save, extraction may be the only remaining option, though we treat this as a last resort rather than a first choice.
What Does the CDC Say About Cavity Prevention?
Cavities are one of the most common chronic conditions in the country, and the data backs that up. According to the Centers for Disease Control and Prevention, about half of children ages six to nine have already had at least one cavity, and roughly one in five adults ages twenty to sixty-four has at least one cavity that has gone untreated. The CDC also notes that dental sealants on the back teeth can prevent up to 80 percent of cavities there, and that fluoride varnish reduces decay in baby teeth by about a third.
What this tells us is simple: prevention works, and it works best when it is consistent. Fluoride toothpaste, sealants where appropriate, and regular exams are not just good habits; they are the same measures public health researchers point to when discussing lower cavity rates. You can read more directly from the CDC’s overview of cavities and tooth decay.
Your Partner in Long-Term Oral Health
Cavities are common, but they are also very manageable when they are caught early and treated with the right approach. At Montgomery Park Dental, we focus on prevention first, from routine exams and cleanings to fluoride and sealant options, and we tailor restorative care to each patient when a cavity does need treatment. Dr. Carolyn Jovanovic and our Conroe, Texas, team bring general, cosmetic, and family dentistry experience to every visit, so you can feel confident in the care your smile receives.
Contact Us Today
If you live in The Woodlands, Conroe, Willis, or Spring, Texas, and want to learn more about what’s involved in our exams and cleanings, our team is ready to help you build a plan that keeps cavities from taking hold. Reach out through our contact page to schedule your next visit with Dr. Jovanovic.
Frequently Asked Questions About Cavities
Can a Cavity Heal on Its Own?
No. Once the acid produced by bacteria has broken through the enamel and formed an actual hole, that damage is permanent and needs a dentist to repair it. The one exception is the very earliest stage of decay, sometimes seen as a white spot on the tooth, where fluoride and improved oral hygiene can occasionally help the enamel remineralize before a true cavity forms. Once a hole exists, only professional treatment such as a filling can restore the tooth.
Are Cavities Contagious?
You cannot catch a cavity the way you catch a cold, but the bacteria responsible for tooth decay can pass between people through shared saliva, such as through kissing or sharing utensils. Picking up these bacteria does not guarantee you will develop a cavity, since diet and oral hygiene play a bigger role, but it is one more reason to avoid sharing items that come into contact with saliva, especially with young children who are still building their own oral bacteria.
How Often Should You See a Dentist to Prevent Cavities?
Most patients benefit from a dental exam and cleaning twice a year, which gives your dentist a chance to catch early decay before it grows into a larger problem. Patients who snack frequently, have dry mouth, wear braces, or have a history of cavities may benefit from more frequent visits. Regular checkups also allow your dentist to apply fluoride or recommend sealants at the right time, both of which lower the odds of a new cavity forming between appointments.
Does a Cavity Always Hurt?
Not at first. Early cavities that are limited to the enamel often cause no pain at all, which is part of why routine exams matter even when your teeth feel fine. Pain tends to appear once decay reaches the dentin or the nerve at the center of the tooth, and by that point, the cavity has usually grown significantly. Catching decay before it hurts generally means a simpler, less invasive treatment.
Is a Cavity the Same as Tooth Decay?
They describe the same underlying process at different points. Tooth decay is the ongoing process of acid wearing down your enamel, while a cavity is the actual hole that results once enough of the tooth structure has been lost. Dentists also use the term dental caries to refer to this same condition. Whatever term is used, the takeaway is the same: catching it early keeps treatment simple, and prevention keeps it from starting in the first place.
About the Author
General Dentist, Montgomery Park Dental
Dr. Carolyn Jovanovic earned her DDS from New York University College of Dentistry and has practiced general dentistry in Conroe, Texas, for over a decade. She is a member of the American Dental Association, the Texas Dental Association, and the American Academy of General Dentistry, with a focus on preventive and family dental care.