Help. Have just today noticed what seem to be white patches on DS's teeth. He is 2yo and has been vomiting over the last 36 hours although this has now ceased (gastroenteritis)and at first I thought perhaps it was some temporary effect from this. Have been searching the internet and coming across worrying information about fluorosis. He is still b'f-ing, and can be up to 5 or 6 times in a 24-hour cycle. Should I be worried? Is this permanent or could it be something else? Will phone dentist tomorrow of course.