ELI5 Orange Juice - how is it economically viable?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

It takes a dozen oranges to make a single glass of OJ, so how is it economically viable? Why does Tropicana taste different to Simply Orange if they are both 100% orange juice? Some people say orange juice is as unhealthy as soda - is this really true? Why does orange juice taste so horrible if you drink it right after brushing your teeth?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: resurrected5yearold, notwutiwantd, pure_opinion, toommyschoolbruh, krescendi, illogictc, fatalbert491, some_toast_, lithium, peregrine4 and myinquisitivemind

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