[Qwertious]

I think immortality and living for a few million/billion/trillion years are essentially interchangeable, for all we can appreciate it - I mean, yes we'll die eventually, but nobody thinks a million years ahead. Hell, Most people don't even think 3 years ahead, from what I've seen of elections.

Risk of violent death is mainly an issue because it's not worth investing in - you're going to be die for sure before age 130 currently, why bother with the smidgen of a chance of death by comet when AGING is around? Remove aging-related death and people will put a whole lot more effort into preventing other things.

As for the human aspects:

Replacing teeth should be easy, since we can already do full implants (we just don't bother much, since most people die before their teeth fall out, if they brush/floss properly) and we'll have a long time to figure it out if we really want the normal type.

Marriage isn't forever currently, and I don't see how immortality would change that.