The lining in stomach and intestine every 4 days

The Gums are replaced every 2 weeks

The Skin replaced every 4 weeks

The Liver replaced every 6 weeks

The Lining of blood vessels replaced every 6 months

The Heart replaced every 6 months

The Surface cells of digestion, top layer cells in the digestion process from our mouth through our large bowel are replaced every 5 minutes

Other larger organs' atomic replacement can be estimated:This data was first pointed out by Dr. Paul C. Aebersold in 1953 in a landmark paper he presented to the Smithsonian Institute, “Radioisotopes - New keys to knowledge”In about a year every atom in your body would have been exchanged. Not a single atom in your body resides there forever andTo be sure this data is confounding and seems to defy logic.The data is not based on urban legend or assumptions yet certainly seems to feel this way., it is a cooperative arrangement of bacteria, viruses, parasites and other welcomed or sometimes unwelcome guests. In fact, just in the case of bacteria,in your body: