'Too much of a good thing'

'Too much of a good thing'
05:55 AM Mar 02, 2010We know that fluoride is good for our teeth, but did you know that too much of it can actually cause stains? According to Dr Phang Hui Jing, a dental surgeon with dental group Team GPA, excessive amounts of fluoride during tooth formation (in childhood) can lead to areas of chalky white spots on your enamel.

I thought almost everybody knew that?