Earlier quoted context omitted.
Ignoring the effect on your teeth, it was my understanding that the fibre in fruit helped counteract many of the negative effects of fructose (at least, keeping your insulin in check). I don't have any proof on hand, so perhaps I'm wrong.
There's afaik a rather big difference between freshly squeezed orange juice, and fruit juices that have been pasteurised. I'm not sure there's that big a difference between eating an orange and drinking the juice - other than the simple fact that the orange will contain "more stuff" that is "not sugar" than the juice - hence it'll be easier to increase sugar intake by drinking, say a litre of orange juice a day, and…
Buying "smooth" (no "bits") juice I would assume is missing most of the fibre.