Keeping your child’s teeth healthy starts earlier than most parents expect and depends on a handful of daily habits more than anything else. The basics are simple: brush twice a day with fluoride toothpaste, limit sugary snacks between meals, and get your child to a dentist by their first birthday. But the details at each age matter, and getting them right can mean the difference between a cavity-free childhood and repeated trips to the dentist’s chair.
Start Brushing With the First Tooth
As soon as your child’s first tooth breaks through the gum, it’s time to start brushing. Use a soft-bristled baby toothbrush and a tiny smear of fluoride toothpaste, about the size of a grain of rice. That small amount provides cavity protection while being safe if swallowed. Once your child turns two, you can increase to a pea-sized amount, and stick with that through age six.
Aim for twice a day, brushing for three to four minutes each time. Morning and bedtime are the two non-negotiable sessions. The bedtime brush is especially important because saliva production drops while your child sleeps, giving bacteria more time to attack tooth enamel. Look for toothpaste that carries the ADA Seal of Acceptance on the packaging.
Most children don’t have the coordination to brush thoroughly on their own until around age six or seven. Until then, you’ll need to do the brushing yourself or at least go back over what they’ve done. A helpful rule of thumb: if your child can’t tie their own shoes, they probably can’t brush their own teeth well enough.
When to Start Flossing
Flossing becomes necessary once your child has two teeth that touch each other, which typically happens around age two or three. Before that point, there are no contact points where food and plaque can hide, so flossing isn’t needed. You’ll be doing the flossing for your child for several years. Floss picks made for small mouths can make the process easier for both of you.
Sugar Frequency Matters More Than Amount
When it comes to cavities, how often your child eats sugar matters more than how much they eat at once. Every time sugar enters the mouth, bacteria produce acid that attacks tooth enamel. That acid attack lasts about 30 minutes before saliva can neutralize it and begin repairing the damage. If your child sips juice or nibbles crackers every half hour, the enamel never gets a break to recover.
This is why a single cookie eaten at lunchtime is far less damaging than a handful of gummy snacks grazed on over the course of an afternoon. Classic research from the landmark Vipeholm study found that even large amounts of sugar consumed during meals didn’t significantly raise cavity risk, while sugary snacks eaten between meals caused a sharp increase in decay. The practical takeaway: keep sweets and starchy snacks to mealtimes whenever possible, and offer water between meals instead of juice or flavored milk.
Sticky foods like dried fruit, fruit snacks, and chewy candy are particularly problematic because they cling to tooth surfaces and extend the acid exposure window well beyond the usual 30 minutes.
Fluoride From Tap Water Helps
Most public water systems in the United States add fluoride at a concentration of 0.7 parts per million, a level designed to strengthen tooth enamel while minimizing any risk of cosmetic fluorosis (faint white spots on teeth). If your household drinks tap water, your child is already getting a baseline level of fluoride protection throughout the day. If you rely on well water or bottled water, your child may be missing out on this benefit, and it’s worth asking your dentist whether a fluoride supplement makes sense.
Dental Sealants Prevent Most Cavities
Nine out of ten cavities in children form in the back teeth, where the chewing surfaces have deep grooves that trap food and bacteria. Dental sealants are thin coatings painted onto those grooves, and they prevent 80% of cavities in the back teeth over a two-year period. The process is quick, painless, and doesn’t require any drilling.
Children typically get sealants on their first permanent molars around age six and their second permanent molars around age twelve. Currently, about 42% of children aged six to eleven have sealants on their permanent teeth. Kids without sealants develop nearly three times as many cavities in their first molars compared to those who have them. If your dentist hasn’t mentioned sealants, it’s worth asking about them once your child’s six-year molars come in.
The First Dental Visit Should Happen Early
Both the American Academy of Pediatric Dentistry and the American Dental Association recommend scheduling your child’s first dental visit within six months of the first tooth appearing, and no later than 12 months of age. Most parents wait far longer than this, but the early visit isn’t really about treatment. It’s a chance for the dentist to check for early signs of decay, assess fluoride exposure, and show you how to care for your child’s mouth at this stage. It also gets your child comfortable in the dental chair before they’re old enough to feel anxious about it.
After that first visit, plan on checkups every six months unless your dentist recommends a different schedule based on your child’s risk level.
Break Sucking Habits by Age Three
Pacifiers and thumb sucking are normal in infancy and toddlerhood, but prolonged use past age three starts to reshape the developing jaw and teeth. Children who continued pacifier use beyond three years showed open bite rates as high as 65%, compared to about 19% in children who stopped before that age. Posterior crossbite (where upper and lower back teeth don’t line up correctly) occurred in 36% of children who kept using a pacifier past three. The American Academy of Pediatric Dentistry recommends weaning off pacifiers by age three for this reason.
If your child is approaching three and still reliant on a pacifier or thumb, gradual reduction tends to work better than going cold turkey. Limiting the habit to bedtime only for a few weeks, then phasing it out entirely, gives your child time to adjust. Children who stop before three show substantially lower rates of bite problems, and minor changes that have already occurred often correct themselves once the habit ends.
What to Do if a Tooth Gets Knocked Out
Kids fall, and sometimes a permanent tooth comes out. If this happens, you have roughly 30 minutes for the best chance of saving it, though reimplantation can still work even after an hour. Pick the tooth up by the crown (the white part you normally see), not the root. If it looks clean, try gently placing it back into the socket and have your child hold it in place by biting on a clean cloth. If you can’t get it back in, place the tooth in a cup of cold milk or have your child hold it inside their cheek next to saliva. Do not store it in tap water, which damages the root surface cells needed for reattachment. Then get to a dentist or emergency room as fast as possible.
Baby teeth that get knocked out are handled differently. Dentists generally don’t reimplant baby teeth because doing so can damage the permanent tooth developing underneath. Still, a knocked-out baby tooth warrants a dental visit to check for any injury to the gums or surrounding teeth.