🦷 How to Prevent Cavities in Kids: A Redding Pediatric Dentist’s Guide

By Dr. Aaron | Children’s Dentistry of Redding, CA

Cavities are the most common chronic childhood disease in the United States — more common than asthma, more common than hay fever. According to the Centers for Disease Control and Prevention, more than half of children between the ages of  and  have had a cavity in a baby tooth, and more than half of adolescents between  and  have had a cavity in a permanent tooth. 

Those are sobering numbers. But here is the thing that I want every parent in Redding to understand: cavities are almost entirely preventable. In over a decade of practicing pediatric dentistry, I have seen firsthand that the families who follow a few consistent, evidence-based habits raise children who rarely — if ever — get cavities. This guide shares exactly what those habits are. 

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🧠 Why Cavities Form (Simple Explanation)

Before we talk about prevention, it helps to understand what actually causes a cavity. Tooth decay is not simply the result of eating sugar — it is the result of a specific biological process. 

Your child's mouth is home to hundreds of species of bacteria. Some of these bacteria — most notably Streptococcus mutans — feed on the sugars and starches in food and produce acid as a byproduct. That acid attacks the mineral surface of the tooth (the enamel), gradually weakening and dissolving it. Over time, this process creates a hole in the tooth — a cavity. 

The key insight here is that it is not sugar alone that causes cavities. It is the frequency of sugar exposure combined with the time that acid is in contact with the tooth. A child who drinks a soda in one sitting and then brushes their teeth is at far lower risk than a child who sips a juice box slowly over two hours. This is why the habits I describe below focus not just on what your child eats, but on how often and when.

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👶 1. Start Early (Even Before Teeth Appear)

Cavity prevention begins before your child even has teeth. The bacteria that cause cavities — particularly S. mutans — are transmitted from caregivers to infants through saliva. Sharing spoons, licking pacifiers, and kissing on the mouth can all transfer these bacteria to your baby's mouth before their first tooth ever erupts. 

This does not mean you need to avoid affection with your child. But it does mean that your own oral health matters. Parents and caregivers who have active, untreated cavities are more likely to transmit cavity-causing bacteria to their children. Keeping your own mouth healthy is one of the most effective things you can do for your child's dental health. 

Once your baby's first tooth appears — typically around  months — begin cleaning it twice daily with a soft, age-appropriate toothbrush and a smear of fluoride toothpaste no larger than a grain of rice. 

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🪥 2. Brush Twice Daily (Technique Matters)

Every parent knows children should brush their teeth twice a day. But the how matters just as much as the when. In my experience, most children — and many adults — brush for about  seconds and miss large portions of their teeth. Effective brushing takes two full minutes, covers all tooth surfaces (front, back, and chewing surfaces), and pays special attention to the gumline, where plaque accumulates most aggressively. 

For children under age , parents should brush for them or closely supervise brushing. Children simply do not have the fine motor skills to brush effectively on their own until around age  or . A good rule of thumb: if your child cannot tie their own shoes, they cannot brush their own teeth effectively. 

Use a soft-bristled toothbrush appropriate for your child's age and replace it every three months or after any illness. Electric toothbrushes with a built-in two-minute timer are an excellent investment for children who resist brushing — the novelty factor alone often makes brushing more appealing. 

Fluoride toothpaste is non-negotiable. Fluoride is the single most effective topical agent for preventing tooth decay. It strengthens enamel, remineralizes early decay, and inhibits the bacteria that cause cavities. Use a grain-of-rice-sized smear for children under , and a pea-sized amount for children ages  to . Always supervise to ensure your child spits rather than swallows.

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🧵 3. Floss Daily (When Teeth Touch)

Toothbrushes cannot reach the surfaces between teeth, and that is where many childhood cavities form. As soon as two of your child's teeth are touching, it is time to start flossing. For most children, this happens around age  to 7 to 8. 

Flossing once daily — ideally before bedtime — removes the plaque and food debris that brushing leaves behind. Floss picks designed for children can make this easier for both parent and child. As with brushing, parents should floss for young children until they have the dexterity to do it themselves, typically around age 7 to 8.

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🍎 4. Focus on Frequency (Not Just Sugar)

Diet is one of the most important — and most misunderstood — factors in cavity prevention. The question is not simply "does my child eat sugar?" Almost every child does. The question is how often their teeth are exposed to sugar and acid throughout the day. 

Every time your child eats or drinks something other than water, the bacteria in their mouth produce acid for approximately  to  minutes. If your child is snacking continuously throughout the day — even on seemingly healthy foods like crackers, raisins, or fruit juice — their teeth are under near-constant acid attack. 

The most cavity-protective eating pattern is structured meals and snacks with water between them. Limit juice to no more than  to  ounces per day for children ages  to , and serve it at mealtimes rather than in a sippy cup throughout the day. Avoid putting your child to bed with a bottle of milk or juice — this is one of the most common causes of severe early childhood caries (baby bottle tooth decay), which can destroy a toddler's front teeth rapidly. 

Cheese, plain yogurt, raw vegetables, and water are among the most cavity-protective foods. Sticky, chewy sweets — gummy bears, fruit snacks, dried fruit — are among the most cavity-promoting, because they cling to tooth surfaces and prolong acid exposure.

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💧 5. Drink Fluoridated Water

Fluoridated community water is one of the great public health achievements of the th century. The CDC has recognized community water fluoridation as one of the ten great public health achievements of the past century. Children who drink fluoridated tap water throughout childhood have significantly lower rates of tooth decay than those who drink primarily bottled water, which typically contains no fluoride. 

If your family drinks primarily bottled or filtered water, talk to Dr. Aaron about whether a fluoride supplement or additional fluoride treatments at your child's dental visits are appropriate. 

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🛡️ 6. Consider Dental Sealants

Dental sealants are one of the most effective preventive tools available, and they are dramatically underutilized. A sealant is a thin, plastic coating painted onto the chewing surfaces of the back teeth — the molars and premolars. These teeth have deep grooves and pits that are nearly impossible to clean thoroughly with a toothbrush, making them the most common site for childhood cavities. 

Sealants fill in these grooves, creating a smooth surface that is easy to clean and resistant to decay. The application is completely painless — no drilling, no numbing, no discomfort. The entire process takes just a few minutes per tooth. Sealants can reduce the risk of cavities in back teeth by up to %, and they last several years with proper care. 

The best time to apply sealants is shortly after the permanent molars erupt — typically around age  for the first molars and age  for the second molars. I will evaluate your child's teeth at each checkup and recommend sealants when the timing is right. 

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🦷 7. Don’t Skip Dental Checkups

Professional dental cleanings remove the tartar (hardened plaque) that brushing and flossing cannot. Even the most diligent home care routine leaves some plaque behind, and over time, that plaque hardens into tartar that only a dental professional can safely remove. Without regular cleanings, tartar buildup leads to gum disease and cavities — even in children who brush twice a day. 

Regular checkups also allow me to catch cavities when they are very small — sometimes before they even require a filling. Early-stage decay can often be treated with fluoride or Silver Diamine Fluoride (SDF) rather than a drill. The longer a cavity goes undetected, the larger it grows, and the more complex and expensive the treatment becomes. 

Most children should be seen every six months. Some children with higher cavity risk benefit from more frequent visits. I will work with you to create a schedule that fits your child's needs. 

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Recommended:

👉 Every 6 months (or more if needed)

💉 8. Professional Fluoride Treatments

In addition to the fluoride in toothpaste and drinking water, professional fluoride treatments applied at your child's dental visits provide an additional layer of protection. These treatments use a higher concentration of fluoride than is available in over-the-

counter products and are applied directly to the teeth in a varnish or gel form. They take just a few minutes and are completely painless. For children at higher cavity risk, fluoride treatments are one of the most cost-effective preventive investments you can make. 

📍 Looking for a Pediatric Dentist in Redding?

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