How Much Toothpaste Should Kids Use? A Fluoride Guide by Age

Look at any toothpaste commercial and you will see a thick ribbon of paste covering the whole brush. That is a lot more than a child needs, and for little ones it is more fluoride than is ideal. On the other hand, some parents skip fluoride toothpaste entirely out of worry, and that leaves baby teeth open to cavities. The right answer sits in the middle and is easy to remember once you know it.

Why Fluoride Toothpaste Matters for Kids

Fluoride makes enamel harder and helps repair the earliest stages of decay before they turn into a cavity. Baby teeth have thinner enamel than adult teeth, so decay can spread through them quickly. Tooth decay is still one of the most common chronic conditions in childhood, and we see the effects in our baby tooth cavity cases every week.

The American Dental Association, the American Academy of Pediatrics, and the American Academy of Pediatric Dentistry all recommend fluoride toothpaste starting with the very first tooth. The key is the amount.

First Tooth to Age 3: A Rice-Grain Smear

As soon as that first tooth shows up, usually somewhere around six months, start brushing twice a day with a soft, small-headed brush and a tiny smear of fluoride toothpaste. Think of a single grain of rice, or just enough to color the tips of the bristles.

• Lay your baby in your lap with their head toward you so you can see inside the mouth.
• Brush gently along the gumline, front and back, where plaque collects.
• Toddlers cannot spit yet, and that is fine. The rice-grain amount is small enough that swallowing it is not a concern.
• Bedtime brushing is the most important one. Saliva flow drops during sleep, so teeth are more vulnerable overnight.

If your baby is cutting teeth and fussy, our guide to teething has tips for getting through it.

Ages 3 to 6: A Pea-Size Amount

Around age 3, move up to a pea-size dab of fluoride toothpaste. This is also the age to start teaching your child to spit out the extra toothpaste after brushing.

Here is a tip that surprises many parents: spit, do not rinse. A big swish of water washes away the fluoride that was just applied. Spitting out the foam and leaving a thin film behind lets the fluoride keep working on the enamel for longer. If your child really dislikes the taste left behind, a very small sip of water is fine.

When Can Kids Brush on Their Own?

Most children do not have the hand coordination to brush well by themselves until about age 7 or 8. A good rule of thumb: if they can tie their own shoes or write in cursive, they are probably ready to take over. Until then, let them have a turn, then follow up with your own pass.

Even after they brush alone, keep an eye on the paste. Kids love squeezing the tube, and children who like the flavor may eat it. Keep toothpaste out of reach of younger children between brushings.

What About Swallowing Toothpaste?

An occasional swallow of a rice-grain or pea-size amount is not harmful. The concern is regularly swallowing large amounts while the adult teeth are still forming under the gums, roughly up to age 8. Over time that can cause dental fluorosis, which usually shows up as faint white streaks or spots on the permanent teeth. It is mostly a cosmetic issue, and using the right amount of paste is the simplest way to prevent it. If you notice spots on your child's teeth, read our article on white spots on teeth, since there are several possible causes.

If a child gets into the tube and eats a large amount, call Poison Control at 1-800-222-1222 for guidance.

Choosing a Toothpaste for Your Child

• Look for fluoride. Many "training" toothpastes for toddlers are fluoride-free. Those do not protect against cavities.
• Look for the ADA Seal of Acceptance. It means the product has been tested for safety and effectiveness.
• Pick a flavor your child likes. A mild fruit flavor beats a fight over strong mint.
• Skip whitening and charcoal pastes for kids. They can be more abrasive than children need.

For more on reading labels, see our guide on how to choose a toothpaste.

A Note for East Tennessee Families on Well Water

Many families in Jefferson County and the surrounding area drink well water, which usually has little or no added fluoride. That makes fluoride toothpaste and in-office fluoride even more important. If your home is on a private well, let us know at your child's visit. Our article on well water and fluoride explains how to find out what is in your water.

How Your Dental Visits Help

Toothpaste at home does most of the work, but checkups add another layer. At each visit we can apply fluoride varnish, which only takes a minute and gives teeth a concentrated boost. Around age 6, when the first permanent molars come in, dental sealants protect the deep grooves that brushes miss. If your child has not been seen yet, our guide to a child's first dental visit explains what to expect. The ideal time for that first visit is by the first birthday.

Common Questions

Is fluoride toothpaste safe for babies and toddlers?

Yes, in the right amount. The American Academy of Pediatrics, the American Dental Association, and the American Academy of Pediatric Dentistry all recommend fluoride toothpaste from the first tooth, using a smear about the size of a grain of rice for children under 3.

What happens if my child swallows toothpaste?

Swallowing a rice-grain or pea-size amount now and then is not dangerous. The concern is regularly swallowing large amounts while adult teeth are forming, which can cause faint white marks called fluorosis. If a child eats a large amount from the tube, call Poison Control at 1-800-222-1222.

Should my child rinse with water after brushing?

It is better not to. Have your child spit out the extra toothpaste but skip the big rinse, so a thin layer of fluoride stays on the teeth and keeps working.