Cavities in Baby Teeth: Causes, Prevention, and Treatment

Cavities in baby teeth are much more than a “temporary” problem. Although baby teeth are eventually replaced, they play an essential role in chewing, speech, aesthetics, and—most importantly—in guiding the eruption of permanent teeth. When a cavity is left untreated, it can progress to pain, infection, and premature tooth loss, situations that may affect a child’s oral development and require more complex treatments in the future.

In this article, we clearly explain what causes cavities in baby teeth, how to prevent them, and the most common treatment options.

Cavities in Baby Teeth: What Are They and Why Do They Occur?

A cavity is a disease caused by the action of bacteria present in dental plaque. These bacteria feed on sugars from the diet and produce acids that, over time, demineralize the enamel and create a cavity.

In baby teeth, this process can progress more quickly because the enamel is generally thinner and less mineralized than in permanent teeth. As a result, an early lesion may evolve more easily if it is not detected and managed promptly.

Main Causes of Cavities in Baby Teeth:

Cavities in baby teeth usually result from a combination of factors. The most common include:

Insufficient or irregular oral hygiene

When brushing is ineffective or not supervised, dental plaque accumulates along the gum line and between the teeth. Even when a child “brushes,” they often lack the manual dexterity needed to remove plaque from critical areas.

Frequent sugar consumption throughout the day

More than the total amount of sugar, it is the frequency that increases risk. Juices, biscuits, snacks, sweetened milk, sugary drinks, and repeated “small bites” throughout the day maintain an acidic environment in the mouth for longer periods.

Prolonged bottle use or falling asleep with milk/sugary drinks

Falling asleep with a bottle (milk, formula, or sweetened drinks) favors early childhood caries, as liquids remain in prolonged contact with the teeth, particularly the front teeth

Lack of fluoride or incorrect toothpaste use:

Fluoride helps remineralize enamel and make it more resistant. Insufficient amounts, fluoride-free toothpaste when fluoride is already indicated, or irregular brushing can reduce this protective effect.

Bacterial transmission and other contributing factors:

Bacterial colonization can be influenced by family habits (such as sharing cutlery) and by factors such as saliva flow, mouth breathing, special healthcare needs, medication (when applicable), and overall diet.

Warning Signs: How to Identify Cavities in Baby Teeth

Pain is not always present in the early stages. Signs that warrant evaluation include:

White opaque spots (especially near the gums), which may indicate early demineralization;

• Brown or black stains;

• Sensitivity to cold, sweet foods, or during chewing;

• Spontaneous pain, particularly at night;

• Persistent bad breath or localized gum inflammation;

• Swelling or a “pimple” on the gums, which may suggest infection.

If there is intense pain, swelling, fever, or difficulty eating, prompt evaluation is recommended.

Can Cavities in Baby Teeth Affect Permanent Teeth?

Yes, particularly when cavities progress to infection. Baby teeth maintain space and guide the eruption of permanent teeth. If a baby tooth is lost too early, neighboring teeth may shift, reducing space for the permanent tooth and increasing the likelihood of future misalignment.

Additionally, infections associated with baby teeth can, in some cases, affect the tissues surrounding the developing permanent tooth. Treating cavities early is therefore a protective measure for both current oral health and future development.

How to Prevent Cavities in Baby Teeth:

Preventing cavities in baby teeth begins long before pain or visible lesions appear. It is based primarily on establishing appropriate daily habits adapted to the child’s age and on the active involvement of parents or caregivers. When these routines are consistent and combined with regular professional evaluations, the risk of early cavities can be significantly reduced and healthier oral development promoted.

Below are the main preventive measures that should be part of a child’s daily routine

Correct use of fluoride toothpaste:

The fluoride concentration and amount of toothpaste should be appropriate for the child’s age and follow dental professional recommendations, ensuring preventive benefit without excess.

Introduction of dental floss when teeth contact each other:

When teeth touch, floss helps remove plaque where the toothbrush cannot reach. This is particularly important for molars and contact areas.

Diet with reduced sugar frequency:

• Limit repeated sugary snacks;

• Prefer water between meals;

• Avoid sugary drinks and juices as regular consumption;

• Be aware of “hidden sugars” (cereals, yogurts, biscuits).

Regular dental visits and preventive measures at the clinic

Regular follow-up allows early detection of initial signs (such as white spots) and, when indicated, the application of preventive measures such as sealants or fluoride reinforcement, always tailored to individual risk.

Treatment of Cavities in Baby Teeth: What Can Be Done?

Treatment depends on the depth of the cavity, symptoms, and the child’s age. In general, options include the following approaches.

Early-stage treatments:

When the lesion is still superficial, it may be possible to control its progression with improved hygiene, fluoride, and preventive strategies, under clinical monitoring

Restorations (fillings):

When a cavity is present, the most common approach is to remove the affected tissue and restore the tooth, recovering chewing function and reducing the risk of progression

Pulp treatment (when the cavity is deep)

If the cavity reaches the inner tissues of the tooth and there is persistent pain or signs of inflammation, treatment directed at the pulp may be necessary, with the aim of keeping the tooth in the mouth for as long as clinically appropriate

Extraction (when the tooth cannot be preserved)

In some cases, the tooth is extensively damaged or recurrent infection is present. Extraction may then be recommended. When a baby tooth is removed prematurely, solutions to maintain space and protect permanent tooth eruption (such as space maintainers) may need to be considered, depending on the case

When Should You Seek an Evaluation?

An evaluation is recommended if you notice suspicious spots, complaints of pain, sensitivity, or changes in chewing. Even in the absence of symptoms, regular dental visits allow cavities to be detected at early stages, when treatment is usually simpler.

If you suspect cavities in your child’s baby teeth, an evaluation helps determine the actual condition of the teeth and define the most appropriate plan according to age, cavity risk, and preventive needs.

Schedule an evaluation with Dr. Cláudio Alferes for a comprehensive clinical assessment and personalized prevention and treatment recommendations.