Baby Teeth Brushing: When to Start and How to Do It

Baby teeth brushing starts the day the first tooth appears, usually around 6 months, with a soft-bristled infant toothbrush and a minimal amount of fluoride toothpaste, about the size of a grain of rice. Until then, simply wipe the gums with a damp gauze. Put simply, baby teeth brushing is the daily routine that removes plaque from milk teeth and, at the same time, teaches your child to take care of their own body.

Quick summary

• Start with the first tooth: soft brush, twice a day, with the last brushing right before bed.
• Up to age 3, use fluoride toothpaste the size of a grain of rice. From 3 to 6 years, the size of a pea.
• From 1 to 2 years, your child can hold the brush, but an adult always goes over the teeth afterwards.
• Plan the first dental check-up with a pediatric dentist around the first birthday.

When to start baby teeth brushing?

Start as soon as you see the first tooth, even if it is just a tiny white tip. Plaque sticks to enamel from the very first day. Milk-tooth enamel is also thinner than adult enamel.

There is work to do before that point, too. After the last feed, wrap your index finger in a damp gauze and gently wipe the gums. No toothpaste is needed. The goal is different: for your baby to get used to someone touching their mouth without experiencing it as an intrusion. This first infant oral hygiene lasts only about half a minute.

Here is a real-life example. Lucía is 7 months old and her lower incisor has just come through. Her parents use the bath time at night, when she is relaxed, and spend about 30 seconds rubbing that tooth with a silicone finger brush. Three weeks later they switch to a small-head toothbrush. Lucía bites it, explores it and, little by little, accepts it as part of the routine.

What happens if your child does not brush their teeth?

If your child does not brush, bacterial plaque builds up and starts to demineralise the enamel, which ends in cavities. In milk teeth this process moves quickly because the enamel is thin.

And what if I don’t brush my 1-year-old’s teeth?

If you do not brush a 1-year-old’s teeth, the first sign is opaque white spots along the gum line, the early warning of early childhood caries. Over time those spots can turn brown.

At this age the risk grows because of one very specific habit: falling asleep with a bottle of milk or juice. The sugar stays on the teeth for hours, while saliva, which protects during the day, nearly disappears during sleep.

Typical mistake: cleaning the teeth after dinner and then giving a bottle to fall asleep. The fix is to change the order: first the feed, then brushing, and then stories and the cot. If your child needs to suck to calm down, offer water. If you notice any spot that worries you, talk to your paediatrician or a pediatric dentist.

How to brush the teeth of a 1 to 2 year old

Between 1 and 2 years, brush twice a day for about two minutes, with fluoride toothpaste the size of a grain of rice and the child lying back with their head supported. You do the real work, they take part.

The position that works best is simple. Sit on the sofa or the floor, with your child lying across your lap and their head resting on you, looking up. That way you can see all the teeth and they feel held. Make small circles over each surface of the tooth, not forgetting the line where the tooth meets the gum. At this age they still cannot spit, and that is fine: with that minimal amount of toothpaste, wiping off the excess with gauze is enough.

When they flatly refuse

Around 18 months the “no” phase arrives. It is normal and, in fact, a good sign of development: your child starts to claim control. So give them control wherever you can.

A common case: Marc, 20 months, presses his lips together as soon as he sees the brush. His parents tried three changes. They let him choose between two coloured brushes. They played a two-minute song that only plays in the bathroom. And they set up turns: “you first, then me”. Within about ten days the struggle dropped considerably. It did not disappear completely, but it went from a daily battle to a routine with the occasional protest.

Dental brushing in children, age by age

The technique changes with age, but the underlying rule stays the same: the adult supervises and goes over the teeth until the child has enough skill, around 7 or 8 years old.

From 0 to 3 years

Gauze on the gums before the first tooth. After that, a small-head toothbrush and fluoride toothpaste the size of a grain of rice. Ask your paediatrician what fluoride concentration suits your child, because it depends on their risk of cavities.

From 3 to 6 years

The amount of toothpaste goes up to the size of a pea. In the Children’s House stage the child already wants to do it alone, and it is worth letting them: they brush first, then you go over the teeth. At this age they also learn to spit without rinsing with water, so the fluoride keeps working.

From 6 years onwards

The first permanent molars come through behind the milk teeth, and many families do not even notice. Check that area carefully. From this age the child can brush with fair independence, although a quick check at night is still a good idea.

Child oral health, beyond the toothbrush

Child oral health depends as much on what the child eats and drinks as on the brush. The American Academy of Pediatrics recommends that the first dental visit take place around the first birthday, and it is advice worth following.

In day-to-day life, what matters most is how often sugar is consumed, not just how much. Sipping juice all morning does more damage than a sweet dessert after a meal. For example, swapping mid-morning juice for water and whole fruit already makes a difference. Also, sucking your baby’s spoon or “cleaning” their dummy with your mouth passes adult bacteria to them.

Step-by-step guide to baby teeth brushing

A steady baby teeth brushing routine is worth more than perfect technique. These steps work from 6 months to 3 years and adapt as your child grows.

1. Choose two fixed moments: after breakfast and right before bed.
2. Put fluoride toothpaste the size of a grain of rice on the brush.
3. Position the child with their head resting on your lap or chest.
4. Brush the outer, inner and chewing surfaces with gentle circles.
5. Spend about two minutes in total, with a song if it helps.
6. Wipe off the excess toothpaste without rinsing with water.
7. Let your child finish with their own brush and put it back in its place.

Baby teeth brushing the Montessori way

In Montessori pedagogy, which the Association Montessori Internationale has promoted since 1929, personal care is part of practical life. Translated to your bathroom: a stable stool to reach the sink, a mirror at their eye level and a cup holding their brush where they can grab it without asking for help. When the child feels that baby teeth brushing belongs to them, they cooperate far more. That infant oral hygiene stops being something done to them and becomes something they do.

A quick checklist to stick on the bathroom mirror:

• Small-head brush with soft bristles, replaced every 3 months?
• Fluoride toothpaste in the right amount for their age?
• Is the last brushing done after the last feed?
• Have you gone over the gum line and the back molars?
• Do they already have a check-up appointment with a pediatric dentist?

Frequently asked questions

When should you start brushing babies’ teeth?

As soon as the first tooth appears, around 6 months. Use a soft-bristled infant toothbrush and fluoride toothpaste the size of a grain of rice, twice a day. Before that point, wipe the gums with a damp gauze after the last feed.

What happens if my child does not brush their teeth?

Plaque builds up on milk-tooth enamel, which is thinner than adult enamel, and white spots and cavities can appear. This makes chewing and sleeping well harder. In addition, milk teeth hold the space for the permanent ones, so it is important to look after them.

What if I don’t brush my 1-year-old’s teeth?

The risk of early childhood caries increases. It usually starts as opaque white spots along the gum line, especially if the child falls asleep with a milk bottle or sugary drinks. If you see those spots, talk to your paediatrician.

How should you brush the teeth of 1 to 2 year olds?

Twice a day, for about two minutes, with fluoride toothpaste the size of a grain of rice. Make gentle circles over all surfaces with the child lying back and their head resting on your lap. Your child can take part, but you always go over the teeth afterwards.

About Tamara Munoz: Certified Montessori guide with more than 10 years supporting families in the Campo de Gibraltar. Specialist in 0-6 pedagogy and prepared environments. Credentials: AMI 3-6 Guide, Diploma in Early Childhood Education. Certification: Association Montessori Internationale (AMI) Full profile.