The scientists have collected teeth from 250 kids who have asthma and 250 kids who haven't to check out the differences.
Milk teeth start to develop when a baby is in its mother's womb and experts reckon a child's chances of getting asthma might be linked to what its mother eats.
Fact File
Asthma facts
Ancient Greek and Chinese doctors knew about asthma
100 million people in the world have it
Attack happens when tubes carrying oxygen to lungs get narrow and inflamed
This causes difficulty in breathing
Dust can trigger the airways to tighten too
Scientists reckon kids who don't get enough important minerals like iron and selenium are more likely to get asthma.
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