A terrible prediction: There is a bacteria that is even now beginning to emerge, and it's primary target will be human teeth. This bacteria will cause teeth to become infected and rot quickly, and it will be easily spread. Within a decade, 50 percent of humanity will have lost all their teeth, and the remainder will suffer from some degree of tooth loss.
We will, of course, soldier on, with implants or dentures. But for the very poor, theirs is a future of toothlessness, of soft food and aching gums. For other, wealthier people, this will be a chance at self-expression, as they choose replacement teeth of unnatural colors, or surprising shapes (vampire teeth will be especially popular.)