No but you do grow entire teeth. Some animals regrow entire limbs. Organisms constantly build and rebuild themselves, sometimes (or at some levels) from scratch

No but you do grow entire teeth. Some animals regrow entire limbs. Organisms constantly build and rebuild themselves, sometimes (or at some levels) from scratch. Fresh cells can be generated at any time. The capacity to regenerate and repair can be lost but it's not intrinsically absent as the "wear and tear" metaphor suggests.