Anyone else having problems with white patchy discolouration of childrens teeth in HK ???? My son is only 3 and we have noticed white patchy discolouration on his front and eye teeth. We took him to the dentist and were told all was ok, but now he is getting brown staining at the top of one of his teeth. PS he doesn't have sippy cups, straight juice and he brushes with an electric toothbrush.