General Dentistry · Pediatric Care · Last reviewed May 2026
Cavity Prevention for Kids: Evidence-Based
Painless, Quick.
Picasso Dental offers free children's examinations, in-clinic fluoride application (up to for full mouth), and fissure sealants at across our six branches in Vietnam. Fluoride varnish and resin fissure sealants are the most evidence-supported preventive interventions in dentistry for children. Best applied as soon as the first permanent molars erupt, typically age 7, with fluoride starting from age 3 for higher-risk children.
What Are Fluoride and Sealants?
Two simple, painless preventive treatments that work together to stop cavities before they start. Fluoride strengthens enamel chemically; sealants protect the deep grooves of back teeth physically. Both are placed without drilling and without anaesthetic.
Fluoride
A naturally occurring mineral that strengthens enamel and helps reverse early decay. Topical application in clinic uses concentrations higher than home toothpaste, typically fluoride varnish at 22,600 ppm. The varnish is painted onto clean, dry teeth and hardens on contact, so very little is swallowed. Re-applied every 6 months for higher-risk children.
Fissure Sealants
A thin protective resin coating applied to the deep grooves on the chewing surfaces of back teeth. Physically blocks food and bacteria from reaching the enamel surface where the toothbrush bristles cannot reach. Most often placed on permanent first molars (around age 7) and permanent second molars (around age 13).
The Evidence Base
Fluoride and sealants are not promotional dentistry. They are among the most heavily studied preventive interventions in the field, with consistent Cochrane systematic review support.
Fluoride Varnish: ~37% Reduction
The 2013 Cochrane systematic review by Marinho et al. analysed 22 trials and concluded that fluoride varnish reduces decay incidence in primary and permanent teeth by approximately 37% in children and adolescents. The protective effect is maintained across study populations and risk levels.
Fissure Sealants: ~76% Reduction
The 2017 Cochrane systematic review by Ahovuo-Saloranta et al. found that resin-based sealants reduce cavities on treated occlusal surfaces by approximately 76% at 2 years compared to no sealant in children at moderate or high caries risk. This is among the strongest preventive evidence bases in dentistry.
Why Picasso for Children's Prevention
Free Initial Children's Examination
Every first paediatric visit is complimentary at every age. We assess cavity risk, count teeth, demonstrate brushing, and recommend fluoride or sealants only where they are genuinely indicated. Nothing is sold by default.
Child-Friendly Approach
No rushing. We explain each instrument before using it, demonstrate on a finger first, and let the child set the pace. Parents are welcome in the operatory throughout. Many children leave their visit asking when they can come back.
Fluoride Varnish, Not Gel
We use fluoride varnish as our standard rather than the older fluoride-tray gels. Varnish hardens on contact, sticks to the tooth surface, requires no tray, has less mess, and minimises the risk of swallowing. Children tolerate it far better than the older gel approach.
Painless Sealant Placement
No drilling, no anaesthetic injection, no numbness. The tooth is cleaned, briefly etched with a mild acid (which does not hurt), dried, then the resin is flowed into the groove and light-cured. Most sealants take only a few minutes per tooth.
Age-Appropriate Scheduling
Younger children get shorter, simpler appointments. School-age children get longer slots. We schedule fluoride and sealant visits when energy and attention levels are highest, usually morning, and avoid stacking treatments that exceed a child's tolerance.
Parental Coaching on Home Brushing
In-clinic fluoride and sealants only work alongside good home care. We coach parents on age-appropriate toothpaste amounts, supervised brushing until age 8, and how to spot early signs of decay. The clinic visit is one part of a broader plan.
When to Start, by Age
Cavity prevention is staged across childhood. Each milestone matches a developmental stage in tooth eruption and behaviour.
Age 1: First Visit
First dental visit, ideally within 6 months of the first tooth erupting. No fluoride or sealants yet. The visit focuses on parental education, brushing technique demonstration, diet review and a low-pressure introduction.
Age 3: Fluoride if Cavity Risk
Fluoride varnish is recommended from around age 3 for children with cavity risk factors: visible decay, deep grooves, family history, high-sugar diet, or inconsistent brushing. Re-applied every 6 months as long as the risk persists.
Age 7: First Sealants
Permanent first molars erupt behind the baby teeth, often without parents noticing. These are the most cavity-prone teeth in the mouth. Sealants placed shortly after eruption deliver the maximum protective benefit.
Age 13: Second Sealants
Permanent second molars erupt at the back. Same indication, same procedure: sealants placed early protect the grooves before food and bacteria get established. By this age children typically tolerate the visit easily.
Throughout Childhood
For high-risk children, fluoride varnish is re-applied every 6 months from age adolescence. Sealants are checked annually for wear and topped up as needed. The protective effect is greatest with consistent recalls.
Adolescence and Beyond
Sealants are placed less frequently in adults, since the highest-risk windows are around new molar eruption. Fluoride varnish remains useful for adults with high cavity risk, exposed root surfaces or orthodontic appliances. Discussed case by case.
Pricing
All children's prices are below. Examinations are complimentary; preventive treatments are priced low. Treatment is recommended only where genuinely indicated, never as a routine package.
| Service | Price |
|---|---|
| Children's examination | Free |
| Fluoride application, fewer than 7 teeth | |
| Fluoride application, 7+ teeth (full mouth) | |
| Fissure sealant, per tooth | |
| Children's scaling & polishing | |
| GIC/FUJI filling, baby tooth | |
| Children's filling, permanent tooth | 200,000 – 400,000 |
| Pulpotomy, baby tooth |
For the full paediatric price list, see Children's Dentistry.
Who Benefits Most From Sealants?
Sealants are highly effective on the right teeth. They are not necessary on every molar of every child. Here is the honest indication list.
Strong Sealant Candidates
Children with deep, narrow grooves on their permanent back teeth that toothbrush bristles cannot reach.
Children with siblings or parents who have had multiple cavities (caries risk runs in families).
Children with high-sugar or frequent-snacking diets.
Children about to start orthodontic treatment, where brushing becomes harder around brackets.
Children with poor brushing technique or behavioural challenges that compromise oral hygiene.
Children with previously sealed teeth that have lost the original sealant.
Sealants May Not Be Needed
Children with shallow, well-cleansing grooves on their molars.
Children with excellent home hygiene, low cavity risk and no family history of decay.
Teeth that have already had a cavity filled (a filling already seals the groove).
Teeth not yet fully erupted, where reliable sealing is impossible. We wait.
Where the dentist judges the time and cost outweigh the marginal benefit.
We will tell you no when no is the right answer.
How a Sealant is Placed
Five steps, no drilling, no anaesthetic. Most sealants are placed in a few minutes per tooth.
Clean & Dry
The tooth is cleaned with a polishing brush and dried. Cotton rolls or a soft retractor keep the area free of saliva.
Mild Etch
A mild acid gel is placed on the groove for a few seconds to micro-roughen the enamel for bonding. No drilling. It does not hurt.
Rinse & Dry
The etch is rinsed off. The tooth is dried thoroughly: dryness is critical for the resin to bond reliably.
Resin & Cure
The resin is flowed into the groove with a small applicator and hardened with a blue curing light for 40 seconds.
Bite Check
The dentist checks the bite to make sure the sealant does not interfere with chewing, polishes any high spots, and you are done.
Fluoride Safety: The Honest Version
Fluoride safety is sometimes debated online. Here is what the major health bodies and the clinical evidence actually say.
What WHO and CDC Say
Per the World Health Organization and the United States Centers for Disease Control and Prevention, in-clinic topical fluoride at standard doses is safe for children when applied by trained professionals. Both organisations classify community water fluoridation and topical fluoride as effective public-health interventions.
Where Concerns Come From
Concerns about fluoride toxicity arise from systemic over-ingestion (chronic swallowing of high-fluoride supplements or water with very high natural fluoride levels), not from topical varnish that hardens on contact and is largely retained on the tooth surface. The dose delivered by topical varnish is small.
Why We Use Varnish, Not Gel
We use fluoride varnish (single-tooth dose, painted on, hardens immediately) rather than the older fluoride tray-gels for children. This minimises swallowing risk, eliminates the gag-reflex problem of trays, and improves the patient experience. Varnish is the modern paediatric standard.
What We Will Tell You No To
Routine systemic fluoride supplements (tablets, drops) for children whose dietary fluoride exposure has not been assessed. Repeat fluoride at intervals shorter than 3 months. Fluoride varnish on a child whose cavity risk is genuinely low and whose home toothpaste use is consistent.
Home Care That Multiplies the Effect
Fluoride and sealants in clinic do not replace home care. They sit on top of it and make it more forgiving when home care is imperfect.
Brushing Twice Daily
Twice daily with age-appropriate fluoride toothpaste: a smear (rice-grain size) for under-3, pea-size for ages 6, full pea-size for 6+. Do not rinse heavily after brushing, the residual fluoride is doing the work.
Supervised Brushing Until 8
Most children do not have the dexterity to brush effectively until around age 7 or 8. Supervise (or do it for them) until then. A short, gentle brushing done by an adult beats an enthusiastic but ineffective solo effort.
Low-Sugar Drinks
Sugary and acidic drinks (juice, soft drinks, sweetened milk) drive cavity risk. Frequency matters more than quantity: sipping a juice across an afternoon is worse than drinking it at one meal. Limit to mealtimes if at all.
Water as Primary Drink
Water between meals. It rinses sugar and acid off the teeth, supports saliva flow, and keeps the mouth chemically neutral. The simplest and most under-rated cavity prevention tool.
Dental Visits Every 6 Months
Six-monthly recall lets us catch decay at the earliest stage, top up fluoride where indicated, check sealant integrity, and adjust the prevention plan as your child grows. Free children's exams at every visit.
Catch Habits Early
Mouth-breathing, prolonged thumb-sucking, reflux and bedtime bottles all increase cavity risk. We screen for these at every visit and discuss strategies with parents before they become entrenched.
Aftercare
Both fluoride and sealants are quick procedures with minimal aftercare. Here is what to do in the hours and weeks after the visit.
After Fluoride Varnish
Avoid eating or drinking for 30 minutes. Avoid hot drinks for the rest of the day. The varnish leaves a slightly yellow film for a few hours, which is normal and brushes off at the next clean. Do not brush vigorously for the rest of the day.
After Sealant Placement
Avoid sticky food (toffees, chewing gum, dried fruit) for 24 hours so the resin can fully settle. Normal eating resumes after a few hours. The sealant should not feel high when biting; if it does, return for a quick adjustment.
Six-Month Recall
Return at 6 months for review. We re-apply fluoride varnish if the child remains in the high-risk category, check sealant integrity for wear or chipping, and update the cavity-risk plan based on what has changed since the last visit.
Annual Sealant Check
Sealants are checked annually for wear or partial loss. Where a sealant has chipped or partly come off, we clean and re-place it: leaving a partial sealant in place can trap food under the remaining edge.
Your Children's Prevention Team
Three of our general dentists handle the majority of paediatric preventive care. Specialty referrals (orthodontics, surgery) are handled in-house when needed.
Dr. Thao Tran
General Dentist
Paediatric preventive care, fluoride application, fissure sealants, baby-tooth restorations. Known for a calm, unhurried chairside manner with younger children.
Dr. Nhung Duong
General Dentist
Paediatric preventive care, fluoride application, fissure sealants, children's fillings. Works across our Hanoi and Da Nang branches.
Dr. Emily Nguyen
Founding Clinical Director
Sets clinical standards for paediatric protocols group-wide. Reviews complex children's cases and trains junior dentists in age-appropriate behaviour management.
Common Questions
When should I bring my child for their first fluoride or sealant visit?
For fluoride: from age 3 if your child has cavity risk factors (deep grooves, family history of decay, high-sugar diet). For sealants: as soon as the first permanent molars erupt, typically age 7. The first dental visit overall should happen by age 1, even though no fluoride or sealants are placed at that age. Children's examinations at Picasso are complimentary.
Are fissure sealants safe for my child?
Yes. Sealants are placed without drilling and without anaesthetic. The 2017 Cochrane systematic review (Ahovuo-Saloranta et al.) confirms resin sealants reduce occlusal caries by approximately 76% over 2 years on treated surfaces with a strong safety profile in children. The materials are similar to those used for tooth-coloured fillings.
Does my child still need fluoride if our tap water is fluoridated?
Most of Vietnam does not have fluoridated tap water at therapeutic levels, so professional topical fluoride is generally beneficial for at-risk children. If you live somewhere with fluoridated water (some international cities), professional application is still indicated for children at moderate or high cavity risk. We assess your child's risk before recommending it.
Will fluoride or sealant placement hurt?
No. Fluoride varnish is painted on with a small brush and tastes mildly fruity; most children find it pleasant. Sealants involve no drilling and no anaesthetic: the tooth is cleaned, briefly etched (a mild acid that does not hurt), dried, then the resin is placed and light-cured. Children typically describe both procedures as easy.
How long do dental sealants last?
Well-placed sealants commonly last 10 years, though they wear gradually and small areas can chip away. We check sealants at every 6-month visit and repair or re-place them where wear is detected. The protective effect against cavities is greatest in the first 2 years and decreases over time as the seal degrades.
Can baby teeth get sealants?
Sometimes, where a baby molar has very deep grooves and the child is at high cavity risk. More commonly, sealants are placed on permanent first molars (erupt around age 7) and permanent second molars (erupt around age 13). Your dentist will recommend sealants only on teeth where the grooves are deep enough to genuinely benefit.
What about systemic fluoride supplements like tablets or drops?
We generally do not recommend systemic fluoride supplements unless prescribed by a paediatrician for a child with documented cavity-risk factors and confirmed low fluoride exposure. Topical fluoride (varnish in clinic, fluoride toothpaste at home) is the preferred and safer route for most children. Systemic over-ingestion is the main fluorosis risk.
My child has a sealant that came off, what do I do?
Book a follow-up visit; we will check the tooth, clean it, and re-place the sealant. A partly-lost sealant should be repaired or replaced rather than left, since food and bacteria can become trapped under the remaining edge. There is no urgency, but do not wait until the next 6-month visit if you notice it has come off.
Are there any allergies or reactions to fluoride or sealants?
True allergies are very rare. Some fluoride varnishes contain colophony (pine resin); we use a colophony-free option for children with known allergies. Sealant resins can rarely cause oral irritation; we ask about prior reactions before placement. Tell us about any medical or allergy history at the start of the visit.
At what age do you stop placing sealants?
Sealants are most beneficial during childhood and adolescence when the deep grooves of newly-erupted molars are at highest cavity risk. Adults with deep, healthy grooves and no decay history can also benefit, though the indication becomes narrower with age. We assess case-by-case rather than applying a fixed cut-off.
Start Here
Book Your Child's
Free Prevention Visit.
The first appointment is complimentary at every age. We will assess cavity risk, check the eruption stage, and recommend fluoride or sealants only where they are genuinely indicated. Quoted in writing before any treatment is booked.