rather than the sugar, it was definitely the acid that etched the enamel of our teeth. we also both got receding gums soon after that.
its ok now cause we're eatin heaps more greens and raw milk & eggs anyway, but all it takes is a pink lady apple, some berries or citrus and the sensitivity comes right back and takes 1-2 days to recover.
we've only heard of a few others that have similar problems, and i think it takes a fair bit of abuse to do it... the burning started at around 600 blueberries, and we had to call it even at 1000 each... (and didn't pay a cent for em
)
Events 
enjoy the nectars for me