How to Brush your Little One's Teeth

How to Brush Your Little One's Teeth

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Nobody warns you that brushing a toddler's teeth can become the hardest two minutes of your day.

Here's how we do it in our house: when to start, how much toothpaste, what the official guidance says, and the part I get asked about most is exactly what to say when they clamp their mouth shut.

When to start

Before there are any teeth. Starting around six months, wipe your baby's gums with a clean damp cloth or a soft finger brush. You're not really cleaning much at that age. You're getting them used to someone putting something in their mouth, which makes everything that comes later easier.

Once the first tooth appears, you're brushing. Twice a day, ideally after breakfast and before bed.

And book the dentist. The AAP recommends a first dental visit by your child's first birthday, or within six months of the first tooth or whichever comes first. Most parents wait much longer than this.

How much toothpaste

This is the question I get most, and the amounts are smaller than most people think:

Under 3: a smear the size of a grain of rice.

Ages 3 to 6: a pea-sized amount.

That's it. The full ribbon of toothpaste across the brush that you see in commercials isn't the right amount for anyone, and it definitely isn't the right amount for a toddler.

What I look in toothpaste

no sodium lauryl sulfate, which is a foaming agent that can irritate little mouths and is linked to canker sores in some kids, and no artificial dyes or sweeteners. Those are worth checking regardless of which direction you go on fluoride.

One thing that matters more than the toothpaste: the mechanical brushing itself, twice a day, every day, and not sending them to bed with milk or juice in a bottle or sippy cup. If a bottle goes to bed, fill it with water.

What actually works at the sink

Explain the why, in their language. Not "you'll get cavities." Try "we're getting the sugar bugs off so your teeth stay strong." Kids cooperate with things they understand.

Brush yours first. Let them watch. Then it's their turn. Modeling does more than instructing at this age.

Give them their own brush to hold while you brush their teeth with a second one. The illusion of control is doing a lot of work here.

Same order every time. Top teeth, then bottom. Predictability lowers resistance.

One song, only for brushing. Same song every night, and it doesn't get played at any other time. The novelty is what keeps it working.

Keep brushing for them longer than feels necessary. The AAP says to assist or supervise until a child has really mastered it, usually around age 10. A four-year-old brushing solo is playing, not cleaning.

What to say when they refuse

This is the part nobody writes down. These are the exact words I use.

When they clamp their mouth shut:

"You don't have to like it. It's still going to happen. Do you want to do it standing up or lying down?"

Two real choices, both of which end with brushed teeth.

When they say no:

"I hear you. Brushing isn't optional, but you get to pick — do you want to go first, or should I?"

When they're crying and you're tempted to skip it:

"I know. I'm going to be quick. One, two, three, and then we're all done."

Then actually be quick, and actually count. If you say three seconds and take thirty, you've taught them your countdown means nothing.

When they want to do it themselves:

"You go first, then I'll finish. That's the deal."

Let them have their turn. Then take yours. Every time, so it stops being a negotiation.

When it's turned into a nightly battle:

"This is happening every night, so let's find the way that works for you."

Then genuinely change something — the location, the position, who holds what, the song. Fighting the same fight the same way every night doesn't teach anyone anything.

What I try not to say: "If you don't brush, your teeth will rot." Fear-based motivation works for about a week and then costs you something. Matter-of-fact works longer.

The short version

Start at six months with a cloth. Brush twice a day from the first tooth. Rice-grain of toothpaste under 3, pea-size from 3 to 6. Dentist by their first birthday. Keep supervising longer than you think you need to. Talk to your pediatrician about fluoride for your specific child.

And when they fight you: fewer words, two real choices, and a fast countdown you actually keep.

The products I use are linked in my [oral health list]. Some links are affiliate links. All proceeds from this site are donated directly to charity.