Immediate implants and teeth after removing teeth

(usa)

can you get immediate implants and teeth after removing teeth:
I currently have a denture on the top (had a few years) and want (need)to get all my lowers removed which are very lose and painful.

I have been told by a doctor in another country (that i would like to go to) that he can do both upper and lower in one 10-15 day trip ..6 implants on the bottom and top, then place a bridge (i think that's what he called it)

other doctors I've talked to, say it's not possible,and say you have to wait a few months after teeth are removed, then implants and wait a few more months, then the teeth.

The doctor actually has some very impressive credentials and I've got nothing but positive feedback from some of his patients.

I have told the doctor (through another party) that I was concerned about others saying it's not possible, but he assures me he can do it...I'm sure it can be done, but will it last...he was also sent a panoramic x-ray that he requested.

any thoughts would be appreciated.