A 4-year-old waking from general anaesthetic missing eight teeth is not a rare scene in UK paediatric day-surgery units. Around 26,000 children a year in England have hospital extractions, the great majority for preventable tooth decay. The cost to the NHS is enormous; the cost to the child — pain, infection, dental anxiety carried into adulthood — is bigger.
This is, almost completely, a preventable problem. The habits that prevent it are simple, take five minutes a day, and can be in place from the first tooth. The two pieces of widely-given but obsolete advice that get in the way: "rinse after brushing" (no — spit, don't rinse) and "wait until they've got most of their teeth before seeing a dentist" (no — go when the first tooth appears, while NHS care is free and easy).
The Healthbooq app covers feeding, hygiene, and care alongside development — useful for noting when teeth come through and any feeding patterns that might be relevant at the dental check.
When the Teeth Arrive
The timing of the first tooth varies enormously, and almost all of it is normal:
- Average first tooth: around 6 months
- Normal range: 4 to 14 months for the first one
- Babies born without teeth, and the rare baby born with a tooth ("natal tooth"), are both ordinary
- Worth a dental review only if no teeth by 18 months
The order is roughly:
| Age | Teeth typically appearing |
|—|—|
| 6–10 months | Lower central incisors (the front bottom two) |
| 8–12 months | Upper central incisors |
| 9–13 months | Upper lateral incisors |
| 10–16 months | Lower lateral incisors |
| 13–19 months | First molars |
| 16–22 months | Canines |
| 25–33 months | Second molars |
By age 2.5–3, most children have all 20 primary (baby) teeth. The exact sequence is variable; gaps and out-of-order eruptions are usually nothing.
Teething: What's Real, What Isn't
Real:
- Sore, red, swollen gums
- Increased drooling
- Mouthing and chewing on objects
- Mild irritability, broken sleep
- A small (≤0.5°C) rise in temperature on the day of an erupting tooth
Not real (despite folklore):
- High fever (≥38°C). If a teething baby is genuinely febrile, treat it as a fever and look for another cause — UTI, ear infection, viral illness. Don't attribute it to teething.
- Diarrhoea
- Respiratory symptoms (coughing, runny nose)
- Nappy rash directly caused by teething
A 2016 systematic review (Massignan et al., Pediatrics) confirmed that systemic illness is not caused by teething, despite how widespread the belief remains. The implication: teething is a convenient and dangerous diagnosis to assume.
Helping with Teething Discomfort
- Cold helps. A clean, refrigerated (not frozen) teething ring or a chilled, clean flannel to chew. Frozen things can damage the gum surface.
- Counter-pressure. A clean finger to massage the gum gently.
- Sugar-free paracetamol or ibuprofen (Calpol, Nurofen for Children) for genuinely distressed older infants — within age-appropriate dosing on the bottle.
- Avoid teething gels containing benzocaine (Bonjela Junior — UK formulation now amended; Anbesol Liquid — withdrawn). Both linked to methaemoglobinaemia in young infants. The NHS no longer routinely recommends benzocaine teething gels.
- Avoid amber teething necklaces. No evidence base; documented choking and strangulation hazards.
- Don't dip a dummy in honey. Honey is unsafe under 12 months (botulism risk) and is straight tooth sugar at any age.
Brushing: The Daily Five Minutes That Decides Most of It
Start brushing the moment the first tooth appears. Use a soft baby toothbrush (Brush-Baby, Mam, Oral-B Stages — anything age-appropriate) and fluoride toothpaste. The crucial pieces:
Toothpaste Strength and Amount
UK Faculty of Dental Surgery / Public Health England guidance (2017, restated in NICE NG30):
- Under 3 years: smear of toothpaste containing at least 1,000 ppm fluoride. ("Smear" = visible film across the brush, not a blob.)
- 3–6 years: pea-sized amount of toothpaste containing 1,350–1,500 ppm fluoride.
- 7+ years: standard adult toothpaste (1,350–1,500 ppm), pea-sized amount.
- Higher-risk children (visible decay, white patches on teeth, dietary risk): GP/dentist may recommend higher fluoride toothpaste (2,800 ppm under prescription) from age 10, or earlier on dentist's advice.
What matters: the toothpaste must contain at least 1,000 ppm fluoride to be effective. Many "natural" or "training" toothpastes marketed for babies contain little or no fluoride and provide essentially no decay protection. Read the label.
US guidance (American Academy of Pediatrics, ADA, 2014 update) is the same: rice-grain smear under 3, pea-sized 3+, fluoride toothpaste from the first tooth.
Spit, Don't Rinse
After brushing, the child should spit out the foam if they can. Don't rinse the mouth with water. Rinsing washes away the fluoride film that goes on doing protective work for the next 30 minutes or so. This is a clear change from what many adults were taught — the spit-don't-rinse advice has been UK consensus since the early 2000s and is the single most overlooked piece of practical advice in domestic oral hygiene.
For under-threes who can't yet spit, swallowing the small amount in a smear is fine — that's why the dose is restricted to a smear for this age.
Twice a Day, the Night Brush Matters Most
Brush twice a day, every day, including weekends and holidays. The night brush is more important than the morning one because the mouth produces less saliva during sleep, removing one of the body's main defences against acid attack. Brushing immediately before sleep, and giving nothing except water afterward, is the single most protective routine.
Until What Age You Brush For Them
Children's fine motor control isn't sufficient for properly effective brushing until around 7–8. Until then, assist with brushing. Patterns that work:
- "I brush, you brush" — child brushes first to feel control, parent then brushes properly afterwards.
- Brushing while the child is on the changing mat or your lap, head supported.
- Letting the child hold a spare brush at the same time.
- Brushing in front of a mirror.
- Singing the same song every night (twice through ≈ 2 minutes — the recommended brushing time).
Toddler resistance to brushing is universal. Strategies:
- Don't make it a negotiation. It's like a nappy change — it just happens.
- Get firm without getting frantic. A wedge bite-block (sold for toddlers, e.g. Brush-Baby Chewable) lets you brush without fingers being bitten.
- For maximum-resistance phases, prioritise the night brush over both. Twice a day is the ideal; the night brush is the non-negotiable.
- Apps and timers (Brush DJ, Disney Magic Timer) help some children.
- Sticker charts can work for 3+.
Flossing
Once teeth are touching (typically by age 2.5–3), interdental cleaning matters. Disposable flossers designed for children (Plackers Kids, Oral-B Glide Flossers) are easier to manage than thread floss. Once a day, ideally before the night brush.
Sugar: Why Frequency Beats Quantity
Tooth decay is caused by acid. The acid is made by bacteria in dental plaque feeding on sugar. The bacteria are present in everyone's mouth. The variable that you control is the frequency of sugar exposure, more than the total quantity.
The mechanism: every time sugar enters the mouth, plaque bacteria produce acid for about 20–30 minutes afterwards (the "Stephan curve"). The mouth's saliva neutralises the acid and the enamel begins to remineralise — but only once the acid attack ends. Multiple sugar episodes throughout the day prevent the mouth from ever returning to a remineralising state.
A child who eats one biscuit at breakfast experiences one acid attack. A child who grazes on six biscuits between 9 am and 12 pm experiences a sustained acid environment for three hours, regardless of total sugar quantity. The grazing pattern produces more decay.
The practical implication: limit sugar-containing foods and drinks to 3–4 eating occasions per day (mealtimes and one or two snacks). Avoid continuous grazing. Free sugars (added sugars, plus the sugars in fruit juice, honey, and syrups) are the most damaging.
Drinks That Matter
- Water and milk are the only routinely-recommended drinks for under-fives.
- Fruit juice — limit to 150 ml per day, only at meals (not between), in a cup not a bottle. NHS guidance.
- Smoothies — same as juice.
- Squash, fizzy drinks, sweetened drinks — actively avoid in the early years.
- Sugar-free squash — better than sugary, but acidic, so still best at mealtimes.
- Tea/coffee — not for young children.
- Milk in a bottle at bed — see below.
The rule of thumb: between meals, water; with meals, water or milk; juice if at all, with the meal in a cup.
Bedtime Bottles and Nursing Bottle Caries
Putting a baby or toddler to bed with a bottle of formula, milk, or juice produces a distinctive and severe decay pattern affecting the upper front teeth ("nursing bottle caries" or "early childhood caries"). The teeth bathe in lactose or sugar through the night with no salivary flow to clear it. The damage can be visible by 18 months and severe enough to require multiple extractions by age 3.
The fix:
- Cot bottles, if used, should contain water only.
- Move to a cup from 6 months; aim to discontinue bottles by 12 months (NHS / NICE guidance).
- Ongoing breastfeeding to sleep is much lower risk than bottle-feeding to sleep — milk flow stops when the baby falls asleep — but isn't risk-free for older toddlers with frequent night feeds, particularly past 24 months. Brushing before nursing helps.
Hidden Sugars
Routine sources of free sugar in young children's diets that often go under the radar:
- Yoghurts (read labels — "fromage frais" pots, fruit yoghurts often contain 10g+ sugar per 80g)
- Cereal bars and "healthy" muesli bars
- Flavoured milk (chocolate milk, strawberry milk)
- Dried fruit (concentrated sugar, sticks to teeth) — fine occasionally; not as a "healthy daily snack"
- Toddler biscuits and "baby snacks" — many contain added sugar
- Cough syrups and oral medicines — sugar-free versions exist; ask the pharmacist
Foods That Help
- Cheese after a sugary food helps neutralise acid (calcium and phosphate)
- Plain yoghurt
- Fresh fruit and vegetables (the fibre in whole fruit binds sugar)
- Water with meals
The First Dental Visit and Ongoing Care
NHS guidance: first dental visit when the first tooth appears, ideally before the first birthday. Many parents wait until 2 or 3, sometimes longer. Earlier is better for several reasons:
- Catches early decay or developmental anomalies when intervention is easy
- Establishes the dentist as a familiar place, not a scary one
- Lets the dentist give individualised advice on brushing technique and dietary risk
- Catches habits (bedtime bottles, prolonged dummy use) before they cause damage
NHS dental care is free for all children under 18 in the UK (and free for over-18s in full-time education up to 19). Find an NHS dentist accepting children at nhs.uk; some areas have specific paediatric or community dental services for children whose parents can't get on a regular NHS list.
What happens at the visit:
- Brief look in the mouth, often on the parent's lap for very young children
- Check on tooth development and any visible decay or staining
- Brushing and dietary advice
- Sometimes a fluoride varnish application from age 3 (NICE recommends 2 applications per year in standard-risk children, more in higher-risk)
Routine intervals afterwards: every 6–12 months depending on caries risk, on the dentist's recommendation.
Specific Situations Worth Mentioning
Dummies (pacifiers). Use is fine in the first 12 months and may protect against SIDS. Aim to discontinue between 12 months and 2 years. Prolonged dummy use beyond 3 affects bite alignment (anterior open bite, posterior crossbite). Don't dip in anything sugary, ever.
Thumb-sucking. Same bite implications if it persists into the 4–5 age range.
White or brown patches on teeth. Always worth a dental review — early decay or developmental enamel defects are easier to treat early.
Knocked-out tooth (dental trauma). Permanent teeth: rinse with milk or saline, reinsert into the socket if possible, hold in place, get to a dentist or A&E within 30 minutes. Baby teeth: do not re-implant (risk to permanent tooth bud); see a dentist same day.
Persistent thumb-sucking, mouth-breathing, or grinding. Worth flagging at the dental review.
What Helps Long-Term
- Brushing routine that's never optional
- Water and milk as the default drinks
- Sugary food at mealtimes only, not as grazing
- First dental visit as soon as first tooth appears
- Going regularly so it's a familiar, calm thing
- Modelling — children whose parents brush in front of them, and value oral hygiene, internalise the habit
These are not heroic interventions. They are five minutes a day, every day, plus a dietary structure that is good for many other reasons. The payoff is a child who reaches adolescence having never had a filling, a general anaesthetic for extractions, or a developing dental anxiety — which is the dental health most adults wish they had.
Key Takeaways
Tooth decay is the most common reason children aged 5–9 are admitted to hospital in England — around 26,000 hospital tooth extractions each year (NHS Digital, latest figures). Almost all of those admissions are preventable. Three things make the difference: brush twice a day with fluoride toothpaste from the first tooth (smear under 3, pea-sized 3–6), spit don't rinse, and limit free sugars to mealtimes (frequency matters more than quantity). The first dental visit should happen when the first tooth appears, not at 2 or 3. NHS dental care is free for under-18s. Putting a baby to bed with a bottle of milk, formula, or juice causes a specific and severe decay pattern in the upper front teeth that's almost completely preventable by switching to water at the cot.
