Green tea consumption may help prevent cavities, but excessive consumption among young children may lead to dental fluorosis due to the natural fluoride content of the plant.
Those eating more sour fruit may risk greater erosion of their tooth enamel (especially if teeth are brushed in a softened state), but there's a simple solution.
For the same reason aspirin should be avoided in pregnancy, chamomile has such powerful anti-inflammatory properties that regular consumption may result in a serious fetal heart problem, premature..