More and more children have molars whose enamel never hardened properly in the first place. For parents this is often unsettling – particularly because the cause still can't be clearly identified.
What MIH actually is
The medical term is molar incisor hypomineralisation, or MIH for short. It describes a disorder in which the enamel of certain permanent teeth – usually the first large molars, often the upper incisors too – doesn't fully harden while it's forming. The result is porous, less resilient areas that appear whitish-yellow to brownish, which is where the popular name "chalky teeth" comes from.
MIH isn't rare: depending on the study, between 10 and 30 percent of all children are affected, and among 12-year-olds the share is even above 30 percent according to Germany's 5th National Oral Health Study. Alongside decay, MIH is one of the most common dental conditions in childhood.
Where it comes from – and what's still unclear
Here's the most honest answer currently available: the exact cause hasn't been conclusively established scientifically. The affected enamel forms before birth and in the first four years of life – factors discussed include lack of oxygen around birth, certain infections or high fever in the first years of life, and genetic factors. Research has not so far been able to confirm a single, clear trigger.
This is important for parents to know, because it removes the basis for a common worry: as far as we know today, MIH is not a result of poor dental care in early childhood. It can't be prevented by better brushing and isn't anyone's fault.
How to recognise it
- Discolouration on the first permanent molars or incisors – whitish-yellow to brownish, often with sharp edges.
- Sensitivity to cold, heat or sweets, sometimes noticeably more pronounced than with normal teeth.
- Increased risk of chipping: the porous enamel can chip even during normal chewing, sometimes shortly after the tooth erupts.
- Affected children sometimes unconsciously brush the sensitive spots less thoroughly – which can allow decay to develop there as well.
The first permanent molar usually erupts around age six, without any baby tooth falling out beforehand – parents easily overlook it for that reason. It's exactly at this age that MIH is often first noticed at preventive check-ups.
What can be done about it
The most important factor is time: the earlier MIH is recognised, the more gently it can be managed. That's why regular preventive check-ups are among the most important appointments there are, especially for children with erupting six-year molars.
Depending on severity, treatment ranges from intensive fluoridation to stabilise the existing enamel, through sealing the particularly vulnerable chewing surfaces, to a filling if structure has already been lost. In very pronounced cases, a crown can occasionally make sense to preserve the tooth long-term. Which approach fits depends on the individual case – we discuss that with you specifically for the affected tooth.
At home, one thing matters most: not brushing harder, but more gently and more regularly, combined with a fluoride toothpaste. For pronounced sensitivity, special care products can make daily life easier – ask us about that rather than trying something on your own.
In short: MIH affects a significant share of all children and isn't the result of poor care. It usually becomes noticeable when the first permanent molars erupt around age six. The earlier it's recognised, the more gently the tooth can be managed – which is why preventive appointments matter especially at this age.