i have seen two points.  one point arguing that destroying every particle in your body and then reforming it would kill the 'you' you but give birth to a new someone who is entirely you and to their knowledge everything continued as normal, but the 'you' you is really gone.  The other argument is that this new exact rearrangement of particles is you and would be the 'you' you and everything is fine.  I have a hard time with each one but i think i lean towards the idea that the 'you' you won't be there anymore more when it is reformed.
i think this automatically happens to all of us. there is a persistent rumor that says our entire bodies entirely regenerate themselves over the course of several years, implying that you are now a completely different physical body than the one you are born with