Tooth Decay in Toddlers | Early Signs in Konstanz

Quick answer: Tooth decay can begin soon after a baby tooth appears. White, chalky or brown marks, visible holes, pain or swelling should be assessed by a dentist. Brushing twice daily with age-appropriate fluoride toothpaste, offering water, limiting frequent sugar exposure and arranging early check-ups reduce risk but cannot replace an examination.

Reviewed by Dr. Kant Oektem. Last updated: August 2026.

Key points

Early childhood caries is especially relevant in children under three, when primary enamel is still developing.
White, chalky, yellow or brown marks cannot be diagnosed reliably from a photograph or online description.
Frequent sweet drinks and prolonged bottle use increase sugar and acid exposure.
Parents should brush from the first tooth twice a day with age-appropriate fluoride toothpaste.
Pain, swelling, fever, discharge or difficulty eating or drinking needs prompt dental advice.

What early childhood tooth decay means

Early childhood caries describes tooth decay in young children, often including children under three. Baby teeth are more vulnerable to decay than mature permanent teeth, and frequent exposure to sugar or acids adds to the challenge.

Primary teeth help children chew and speak and hold space for permanent teeth. A decayed baby tooth can hurt. Losing a tooth early can also affect the space available as the permanent teeth develop.

Baby teeth can develop decay soon after they erupt.
Early childhood caries is especially relevant before age three.
Baby teeth need care even though they are temporary.

Signs parents should not ignore

Early decay may appear as a matte, chalky or white area. Yellow or brown marks, rough surfaces and visible pits or holes should also be checked. White marks have several possible causes, so their meaning cannot be confirmed safely online.

As decay progresses, a tooth may become sensitive or painful. Swelling, discharge, fever, strong mouth odour or difficulty eating and drinking are reasons to seek advice promptly rather than wait for a routine visit.

Matte, chalky or white marks on a baby tooth.
Yellow, brown or dark discolouration.
A rough surface, pit or visible hole.
Sensitivity, pain, one-sided chewing or avoiding food.
Swelling, discharge, fever or a child who seems unwell.

Bottles, sugar and eating breaks

Tooth decay is not only about the total amount of sugar. Frequent or prolonged contact leaves less time for saliva and fluoride to support the tooth surface. Juice, squash, fizzy drinks and sweetened drinks should not be offered for prolonged sipping from bottles, straws or training cups.

Plain water is a suitable drink for thirst. Breast milk and formula are nutritional feeds and should not be changed without advice. If night-time drinking is difficult to change, discuss the feeding routine with the child’s medical and dental team.

Do not offer sweet drinks over long periods.
Do not use juice, squash or fizzy drinks in a comfort bottle.
Offer plain water as the usual thirst drink.
Do not use sticky fruit pouches as a prolonged sucking activity.
Keep sugary snacks occasional rather than constant through the day.

Brushing and fluoride

Start brushing as soon as the first tooth appears, twice a day, with a small soft toothbrush. Use the toothpaste amount and fluoride strength recommended for the child’s age and local dental guidance. In Germany, the KZBV advises 1,000 ppm fluoride with a rice-grain amount from the first tooth and a pea-sized amount from age two.

Young children can practise, but they cannot reliably clean every surface for a long time. Parents should finish the brushing and avoid adding fluoride supplements without professional advice. A dentist may discuss fluoride varnish when caries risk is higher.

Brush twice daily from the first visible tooth.
Use age-appropriate fluoride toothpaste and the recommended amount.
Finish brushing until the child can reach all surfaces reliably.
Ask before combining fluoride sources or supplements.
Discuss fluoride varnish with the dental practice when risk is increased.

When to book a first dental review

In Germany, dental prevention can be used from six months of age. Early visits assess more than visible teeth: they give parents practical advice about food and drinks, brushing, fluoride and habits. Families do not need to wait for pain before arranging care.

A review is especially useful when a mark, rough area or hole is visible. The dentist examines the finding and explains whether prevention, fluoride varnish, monitoring or treatment fits the child’s age, risk and cooperation. Online information cannot replace that examination.

Plan the first visit after the first tooth and during the first year.
Show white, brown or rough marks promptly.
Use early visits to discuss food, brushing and fluoride.
Match the plan to the child’s findings, age and cooperation.

What happens when decay is suspected

During an examination, the dentist distinguishes early mineral loss from a true cavity. Early changes can sometimes be controlled when plaque, fluoride and sugar exposure are addressed. A true cavity does not close by itself and needs a dental decision about the next step.

The plan depends on the size and position of the lesion, the child’s caries risk, age and ability to cope with care. Until the appointment, keep cleaning gently and do not try to repair the tooth or place medicine directly on it.

Early mineral loss and a visible cavity are different findings.
The examination guides prevention, monitoring or treatment.
Do not wait for severe pain before asking for advice.
Rapid swelling or breathing and swallowing problems are urgent.

Related guides from the practice

You may also find our guides to baby teething and first teeth, fluoride toothpaste, the first dental visit, dental sealants, dental fillings, dental check-ups and contacting the practice useful. These guides support preparation but do not replace an examination.

FAQ

What does tooth decay look like in a toddler?

Early decay may appear as a matte, chalky or white mark. Yellow or brown areas, rough surfaces, visible holes, sensitivity or pain also need a dental check. White marks have several possible causes, so an online description cannot confirm whether a spot is decay.

Can early tooth decay go away?

Early mineral loss can sometimes be controlled when plaque, fluoride and sugar exposure are addressed. A true cavity does not close by itself. A dentist should assess the tooth and discuss prevention, fluoride varnish, monitoring or restorative care according to the child’s findings.

Does a bottle cause cavities?

A bottle itself is not the only cause. The main concern is frequent or prolonged contact with sugary or acidic drinks, especially during comfort sucking or sleep. Do not use juice, squash or sweetened drinks for prolonged sipping; discuss night feeding needs with the child’s clinician.

How should I brush my toddler’s teeth?

Brush from the first tooth twice a day with a small, soft toothbrush and age-appropriate fluoride toothpaste. Parents should finish the brushing until the child can clean all surfaces reliably. Use the recommended amount, encourage spitting and ask about fluoride sources before adding supplements.

When should my toddler see a dentist for possible decay?

Book a dental review for white, brown or rough marks, visible holes, ongoing sensitivity or pain. Swelling, discharge, fever, difficulty eating or drinking, or a child who seems unwell needs prompt advice. Breathing or swallowing problems require immediate medical help.

Medical context and sources

These references support patient orientation and do not replace diagnosis, examination or individual treatment planning.

Tooth Decay in Toddlers: Early Signs and Prevention