I'm not sure if I fully understand the question, but it would be dependant on the specific bracelet. Some are built with screws or pins in every link up to the endlinks (rare) and they could easily be completely taken apart. Most have screws or pins for the first 3 - 5 links on each end, and then the rest are friction-fit with great pressure and cannot be taken apart without ruining the bracelet, so don't try if you care about it.
Are you asking because you have one that you want to clean completely? If so, you can do this in an ultrasonic bath without taking it apart, and will clean out all the nooks and crannies.
It can be done, if you have the tools, but might be easier to send to a pro and pay to get it refreshed.
To eliminate the stretch in the bracelet will require inspection and possible correction of the screwbars, friction pins, or whatever links it, as well as checking the tolerances within the hollow link tubes themselves to make sure they are not out of round and making sure each link seats correctly to the surrounding ones.
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