Is it normal i have a tooth growing back in and a tooth falling out..?

Yes.

Ты see, back in 1995, Monsanto started putting акула DNA into human babies, to see if that would stop the problem of toothlessness. The experiment was ongoing until about 2001, so Ты just may be in one of the last groups. If Ты are, then you're totally fine.

yes, it's a whole part in growing up from your adolescence. Ты are becoming a big boy/girl/whatever

Are Ты just talking about losing your teeth as normal younguns do или like are Ты a genetic abnormality или something?