What Your Child's Teeth Need at Every Age

Dental care changes as your child grows, and what matters at two is different from what matters at twelve

Your child's first tooth usually arrives around six months, but dental care starts before that — with you. Newborns don't need a toothbrush, but they do need their gums wiped clean after feeding. Once teeth arrive, the routine shifts. By age one, your child should see a dentist. By age three, they should be brushing twice a day with fluoride toothpaste. By age six, they lose their first tooth and start the years of mixed dentition — a time when cavities are most common because kids brush poorly and eat more snacks. Each stage has specific things to watch for, and knowing what's normal at each age keeps you from missing something that needs attention.

Key Takeaways

• Wipe your newborn's gums after feeding, and schedule the first dental visit by age one or when the first tooth appears.
• Use a rice-grain amount of fluoride toothpaste for children under three, and a pea-sized amount from age three to six.
• The years from age six to twelve — when baby teeth are falling out and permanent teeth are coming in — are when cavities happen most often.
• Flossing becomes necessary once teeth touch each other, usually around age two or three, and remains important even during the mixed dentition years.
• By age seven or eight, most children can brush and floss with less direct help, but supervision until age ten catches the spots they miss.

Birth to Twelve Months: Before and Just After the First Tooth

Your baby's teeth are already forming under the gums before you see them. During pregnancy and infancy, your child needs fluoride and calcium, which come from breast milk, formula, or both. You don't need to do anything special — just know that what you eat and drink during pregnancy affects your child's tooth development, and what your baby drinks in the first year matters for the enamel that's forming.

Once your baby is born, wipe their gums with a clean, damp cloth after each feeding. This removes milk residue and gets your baby used to the feeling of oral care. When the first tooth appears — usually between four and twelve months, though the range is wide — switch to a soft-bristled toothbrush made for infants. Use water only, or a smear of fluoride toothpaste smaller than a grain of rice. Your baby will swallow most of it, and that's fine; you're not trying to brush thoroughly yet, just establish the habit.

Schedule your child's first dental visit by age one, or within six months of the first tooth, whichever comes first. Many parents wait until age two or three, but early visits let the dentist catch problems early and let your child get used to the chair and the sounds. The dentist will also check for natal teeth (teeth present at birth) or neonatal teeth (teeth that erupt in the first month), which are rare but need monitoring.

One to Three Years: Building the Habit and Watching for Decay

By age one, your child probably has several teeth. Brush twice a day — morning and before bed — with a soft toothbrush and a pea-sized amount of fluoride toothpaste. Your child will swallow most of it, which is safe at this age. The goal is to remove plaque and introduce fluoride to the enamel that's still forming.

Around age two or three, once teeth are touching each other, start flossing once a day. Use floss picks made for small hands, or traditional floss if you're doing it for them — and at this age, you are doing it. Flossing removes food and plaque from between teeth, where a toothbrush can't reach. This is the age when early childhood caries (cavities in very young children) most often start, usually from frequent exposure to sugary drinks or prolonged bottle feeding at night.

Limit juice, milk, and formula between meals. Water is fine anytime. If your child uses a bottle or sippy cup at night, fill it with water only. Milk and juice sitting on teeth overnight create the perfect environment for decay. By age three, most children can hold a toothbrush and mimic brushing, but they can't do it effectively — you're still doing most of the work, with them "helping."

Three to Six Years: Fluoride, Flossing, and the First Permanent Teeth

At age three, switch to a pea-sized amount of fluoride toothpaste — the same amount you'd use for an adult, just in a smaller mouth. Your child still swallows some, but by now they're learning to spit. Brush twice daily, and continue flossing once daily. Your child can now hold the toothbrush and do more of the brushing, but supervision is still essential; most three- to five-year-olds miss large sections of their teeth.

Around age five or six, the first permanent molars erupt in the back of the mouth, behind the baby teeth. These teeth are especially vulnerable to decay because they're harder to reach and clean. Some dentists apply dental sealants — a thin plastic coating that protects the chewing surface — to these molars. Sealants are not universal; ask your dentist whether your child's teeth would benefit.

By age six, your child's first baby tooth usually becomes loose and falls out. This is normal and exciting, but it's also a time when decay can accelerate. The gap where the tooth fell out can trap food. The remaining baby teeth are still there and still need brushing and flossing. Continue the twice-daily brushing and daily flossing routine, and keep sugary snacks and drinks limited.

Six to Twelve Years: Mixed Dentition and the Cavity Years

From age six to twelve, your child has a mix of baby teeth and permanent teeth — a stage called mixed dentition. This is when cavities happen most often. The permanent teeth are new and their enamel is still hardening. Baby teeth are thinner and more prone to decay. Your child is eating more independently, often choosing snacks, and their brushing and flossing skills are still developing.

Continue brushing twice daily and flossing once daily. By age seven or eight, many children can brush and floss with less direct help, but supervision until age ten catches the spots they miss — usually the inner surfaces of the lower front teeth and the back molars. Make it a routine: brush together in the morning and before bed, and check their work. Let them brush first, then you do a quick pass to catch what they missed.

Around age twelve, the last baby teeth fall out and the permanent teeth are mostly in place. By this age, your child should be able to brush and floss independently, though reminders are still necessary. The permanent teeth they have now are the ones they'll live with, so cavity prevention during these years has lifelong consequences.

Fluoride: What It Does and How Much Is Safe

Fluoride is a mineral that hardens tooth enamel and makes teeth more resistant to decay. It's in most toothpastes, many municipal water supplies, and some foods. For children, the right amount of fluoride prevents cavities; too much during tooth development can cause dental fluorosis, a cosmetic condition that causes white spots or streaks on the teeth.

The amount of fluoride in toothpaste is measured in parts per million (ppm). Toothpaste for children under three should have 1,000 ppm; toothpaste for children three and older should have 1,450 ppm or higher. Check the label. If your water is fluoridated (ask your dentist or check your local water report), your child is getting fluoride from drinking water plus toothpaste. If your water is not fluoridated, your dentist may recommend a fluoride supplement or a higher-fluoride toothpaste.

The key is supervision and the right amount. A rice-grain smear for children under three, a pea-sized amount for children three to six — these amounts are small enough that swallowing them is safe, and they're large enough to protect the teeth. By age six or seven, children can usually spit out toothpaste reliably, and the risk of fluorosis drops significantly.

What to Watch For at Each Stage

Some signs mean your child needs to see a dentist sooner than the regular schedule. In infants and toddlers, watch for discolored or pitted teeth, which can indicate problems during tooth development. In children three and older, watch for white spots or brown spots on the teeth — these are early signs of decay. Swelling or redness of the gums, or bleeding when brushing, can indicate gum disease, which is rare in children but possible.

Tooth grinding (bruxism) is common in children and usually not a problem, but if your child grinds their teeth heavily or complains of jaw pain, mention it to the dentist. Thumb sucking or pacifier use past age four can affect how the permanent teeth come in; the dentist can advise whether intervention is needed. Injuries to the teeth — a chipped tooth, a tooth pushed up into the gum, or a tooth knocked out — always need prompt dental attention.

Bad breath in children is usually just food debris or dry mouth, but if it persists despite good brushing and flossing, it can indicate a cavity, gum disease, or a sinus infection. Difficulty chewing or complaints of tooth pain should never be ignored, even if you don't see an obvious cavity.

Building a Routine That Lasts

The dental habits your child builds now shape their teeth for life. Make brushing and flossing part of the daily routine, like getting dressed or eating breakfast. Brush together when you can — children learn by watching. Let them pick a toothbrush they like, or a toothpaste flavor that appeals to them. Make it matter-of-fact, not a battle.

Limit sugary drinks and snacks, not because sugar is forbidden, but because frequent exposure to sugar feeds the bacteria that cause decay. Water is always fine. Milk and unsweetened juice are fine at meals. Candy and soda are occasional treats, not daily snacks. If your child does have something sugary, brush or rinse with water afterward.

Regular dental visits — usually twice a year starting at age one — let the dentist catch problems early and let your child stay comfortable with the dental environment. By the time your child is a teenager, good oral hygiene should feel automatic, not like a chore.

Frequently Asked Questions

When should I start taking my child to the dentist?

By age one or within six months of the first tooth, whichever comes first. Early visits establish the habit and let the dentist monitor tooth development. Many pediatricians and dentists recommend the first visit by age one, even if only a few teeth are present.

How much toothpaste should I use for my toddler?

For children under three, use a smear smaller than a grain of rice. For children three to six, use a pea-sized amount. These amounts are small enough to be safe if swallowed, and large enough to protect the teeth. Check the fluoride level on the label: under three should be 1,000 ppm, and three and older should be 1,450 ppm or higher.

My child refuses to brush their teeth. What should I do?

Make it routine and low-pressure. Brush together, let them pick the toothbrush or toothpaste flavor, and keep it short — two minutes is the goal, but even 30 seconds is better than nothing. Avoid power struggles. If your child is very resistant, ask the dentist for strategies; sometimes a child will cooperate better for the dentist than for a parent.

Is it normal for my child to grind their teeth at night?

Yes, tooth grinding is common in children and usually not a sign of a problem. It often stops on its own by age nine or ten. If grinding is heavy, causes jaw pain, or wears down the teeth noticeably, mention it to the dentist. A night guard is rarely needed in children but may be recommended in specific cases.

What should I do if my child chips or breaks a tooth?

Call the dentist right away, even if it's after hours. If the tooth is knocked out completely, rinse it gently with water (don't scrub), and try to place it back in the socket or keep it in milk until you reach the dentist. Whether the tooth can be saved depends on how quickly you get to the dentist and whether it's a baby tooth or a permanent tooth.