The MIH: a disease of the child's teeth still unknown

The hypomineralization of molars and incisors (MIH) affects the tooth enamel, which is more fragile, and spots appear on the molars or incisors involved. In France, it concerns between 15 and 18% of children from 6 to 9 years old.

Agathe is a happy seven-year-old girl, but at school, her classmates are not always benevolent. "There are some who say that I do not brush my teeth," she tells the teams of France 2 who filmed it. Tasks on her teeth are the source of these mockery, because the girl is affected by hypomineralization of the molars and incisors (MIH). This disease was reportedly discovered in the mid-1970s, according to the Union of Women Dentists. Today, between 15 and 18% of children aged 6 to 9 would be affected, but many are undiagnosed.

More fragile teeth

The MIH affects at least one of the first molars, or even 4 in some cases, and also attacks the incisors. It is identified with the tasks that it leaves that are between the white and the yellow-brown and whose size can vary according to the individuals. It is necessary to wait for the appearance of the definitive dentition to be able to locate the disease, that is why the children are often diagnosed around 6 years old.

When a tooth is affected, it is more sensitive, more fragile and more prone to cavities. It is possible to treat MIH by applying fluoride varnish to the dentition or restoring the lesions, using materials such as composite resin. These techniques strengthen the enamel of the tooth, which becomes less sensitive to external aggressions (hot / cold, chewing, etc.).

Uncertain origins

For now, we do not know the exact origins of the disease, several hypotheses are advanced. The meeting of associations "Network Environment Health" (RES) involves endocrine disruptors: exposure to bisphenol A (BPA) during pregnancy could be the cause of MIH according to some studies conducted on rats.

Better inform dentists

In the case of Agathe, a resident of Agen, her mother had to travel 150 kilometers to find a dentist able to treat her. This is a common problem for parents of affected children: in some areas, it is difficult to find a dentist who can diagnose the disease and assign appropriate care. However, well cared for, the MIH no longer presents a danger for the child.