You feel it before you see it: a hard little ridge along the gum that was not there last week. A first tooth is a milestone, and it quietly changes the job — until now there was nothing to clean.
The short version, so you can stop reading if the baby wakes up: start brushing the day the first tooth appears — twice a day, a tiny smear of fluoride toothpaste, one of those times just before bed — and book your baby in with a dentist. That is the whole first week. Nearly everything else you will be told about baby teeth can safely wait months or years.
A quick note: This article is general information only and is not a diagnosis or a substitute for professional dental advice. Every baby is different, and only a registered dentist can assess your child's own situation. If you notice pain, swelling, marks on a tooth, or anything else that worries you, please book an appointment.
Day one: start cleaning the tooth that has arrived
There is no waiting period and no "let it settle in" phase. A tooth is a surface plaque can sit on from the day it breaks through, so cleaning starts now, even if the tooth is barely a sliver. What you need is small: a baby toothbrush with a small head and soft bristles, and a fluoride toothpaste. Nothing else.
- How much toothpaste: a smear — roughly a grain of rice on the brush, not a stripe along it. The packaging usually gives an age guide, and it is worth reading, because children's amounts are much smaller than adult ones.
- Which toothpaste: a fluoride one at the strength suitable for their age. Fluoride does the protective work, which is why a "gentle, fluoride-free" tube is not the safer-sounding choice it appears to be. Our guide to kids' toothpaste versus adult toothpaste explains the difference, and your dentist or health visitor can confirm what suits your child.
- How to hold them: most parents find it easiest with the baby on their lap, head resting back against their body, so you are looking down into the mouth rather than at it from the front.
- How long: as long as they will tolerate at first. A few seconds of gentle brushing on all sides of one tooth is a genuine success.
- Afterwards: wipe away the excess rather than rinsing the mouth out with water. Leaving a little fluoride on the tooth is the point of using it — the same principle as the adult routine, spit rather than rinse.
If the whole thing takes fifteen seconds and ends in a protest, you have still done it. Twice a day, every day, is what protects teeth; perfect technique is not on the table with a baby and does not need to be.
Day two to three: look at what happens at night
The single biggest thing you can change in this first week is not brushing technique — it is what is in the mouth overnight.
Saliva flow drops while your baby sleeps, so anything sweet left on a new tooth sits there for hours with far less natural rinsing. Milk, including formula and breast milk, contains natural sugars, and juices and sweetened drinks contain more.
- Brush last thing, after the final feed of the evening, so the tooth goes to bed clean.
- Avoid sending a baby to sleep with a bottle in the cot, or letting one become an all-night comfort item once teeth are present.
- Water is the only drink that is always safe between meals once teeth arrive.
- Move towards a free-flow cup rather than a bottle for drinks during the day as your baby gets older — your health visitor can advise on timing.
Changing the bedtime order — feed, then brush, then bed — is the highest-value habit in the whole list.
Day four to seven: register your baby with a dentist
General UK guidance is to take a child to a dentist as soon as their first teeth come through, rather than waiting until they are old enough to sit still or complain. NHS dental care for children is free.
Two useful things come out of that early appointment, and neither is a filling. A dentist can look at how the teeth are coming through and answer your questions with your actual child in the chair — and your baby gets used to the room, the chair, and the light while nothing uncomfortable is happening, which is a genuine investment in how the next fifteen years of appointments go.
If you are not registered anywhere, this week is a good time to sort it, as availability varies a lot by area. Our guide to how often to see a dentist covers how intervals are set; children are often seen more frequently than adults.
What you can safely ignore for now
Advice aimed at parents tends to arrive all at once. Most of it is not relevant this week.
- Flossing. There is nothing to floss between until teeth actually touch each other, which is usually well down the line. Your dentist will tell you when it becomes useful.
- Electric toothbrushes. A manual baby brush is entirely adequate; switch later if you prefer.
- Mouthwash. Not for babies or toddlers, who cannot reliably spit.
- The order the teeth arrive in. There is a rough pattern and a wide range of normal around it. Late teeth or an unusual order is a question for a routine appointment, not an emergency.
- Gaps and crooked-looking teeth. Baby teeth are often spaced or slightly turned, and how the adult teeth will sit is years away from being answerable.
- Whitening, special diets, and gadgets. None of it belongs near a baby.
Teething: what usually helps, and what to check
The tooth arriving and the teething are two separate things, and teething often causes more worry than the tooth itself. Babies commonly get sore, red gums, more dribbling than usual, and a strong urge to chew on everything in reach.
What generally helps is simple: something cool and firm to chew on, such as a teething ring, and gentle pressure on the gum with a clean finger. If you are considering any medicine or gel, ask your pharmacist, GP, or health visitor first — products vary by age and we do not give medication advice here.
One thing is worth a professional opinion rather than a search: a high temperature or a baby who seems genuinely unwell. That is often put down to teething and sometimes is not, so speak to your GP or health visitor.
Signs worth asking a dentist about
Most first teeth arrive uneventfully. Book an appointment rather than waiting if you notice any of these:
- white, brown, or dull patches on a tooth surface,
- a tooth that comes through an unusual colour,
- gums that are swollen, bleeding, or sore in one spot rather than generally,
- your baby refusing to feed or clearly in pain,
- any knock or injury to the mouth or a new tooth.
None of these mean something is definitely wrong. They mean the question has moved beyond what an article can answer.
The first week, in order
- Brush the tooth twice a day with a smear of fluoride toothpaste, one of them last thing at night.
- Wipe, do not rinse, afterwards.
- Reorder the bedtime routine so the final feed comes before brushing.
- Make water the between-meals drink.
- Register with a dentist and book a first appointment.
- Leave everything else until your dentist raises it.
FAQ
When should I start brushing my baby's teeth?
As soon as the first tooth appears. Before that there is no tooth surface to clean, though some parents choose to wipe the gums with a clean cloth. Once a tooth is through, brush twice a day, including last thing before bed.
How much toothpaste should a baby have?
A smear about the size of a grain of rice, not a full strip along the brush. Amounts increase as children get older, and the packaging usually gives an age guide. Your dentist can confirm the right strength and amount for your child.
Do baby teeth matter if they are going to fall out anyway?
Yes. They help with eating and speech and hold space for the adult teeth behind them, and decay in them can be painful and need treatment. Habits start here too — a child used to brushing rarely has to be taught it later.
When should my baby first see a dentist?
General UK guidance is as soon as their first teeth come through. NHS dental care for children is free, and an early visit is mostly about familiarity rather than treatment.
My baby hates having their teeth brushed. What can I do?
Keep it short, keep it calm, and keep it twice a day rather than perfect. Try a different position, a time when they are not already tired, or letting them hold a brush of their own while you use yours. If it stays a battle, mention it at your next appointment — practice teams see this constantly.
Next step
A first tooth turns a milestone into a small daily job, and the job really is small: a smear of fluoride toothpaste twice a day, a clean mouth at bedtime, and water between meals. Get those going this week and leave the rest until someone qualified tells you it matters. For a proper answer about your own baby rather than a general one, Dental Clinic UK can help you find a dentist near you to register with and ask.
