Can we correct DNA while the body grows by changing the evolving cells?

Question

Supposedly, the body reinvents itself every seven years although we are aware that healing cells can do this in days. We have the ability to change physical attributes in the womb. Would like to see specific areas of the body isolated and surrounded by a microscopic surgical area that can be viewed and corrected via computer instruction...all while the patient continues working.
Ni

Answer 1

The seven years thing is not totally accurate. Allegedly, cells are renewed (though division and death) at a rate that replaces them all in seven years, but that is not perfectly exact. Nerve cells, for instance, do not readily die (they will die only when the whole body dies) and do not really divide and regenerate (which is why it is so hard to recover from spinal chord injury or brain stroke).
On the other hand, cells in the intestine last just a few hours before dying and being replaced.
But there is one constant in all those: the DNA of those cells remain the same, unchanged. Correcting the DNA would involve splicing bits of genes here in there -- which is something that virus do to a certain degree, for their own benefit -- but to do that on ALL the cells. How can one target so many cells simultaneously?
It would be cool, if only to repair people with genetic defect, but we haven't got the technology to do something like that yet.

Answer 2

Yes, and No
Olny some cells "change every 7 years or so. Skin, muscle,aad various other cells but not all.Atempting to modify this sequence would in the word of and educated guess skyrocket cancer and other defects

Answer 3

That would be cool, we could have a hair color change pill. And watch the new color grow.

Answer 4

there are so many scientists working on this very thing right now. maybe someday they will figure it all out, and be able to do it.....