Every single human consists of the material in which to heal itself, lets take for instance, our skin. A healthy human body's skin consists of two layers, the epidermis (the layer of skin you can see and touch) and the dermis (the innermost layer in which you cannot see or touch unless the epidermis is damaged). These two layers exist in a constant state of equilibrium, thus protecting your body from the external environment. When the epidermis is broken your body immediately starts the healing process.
When a wound is healing there are four stages that it must go through in order to complete said healing process. Stage one: hemostasis, this is when your blood collects and hardens to stop the flow of blood leaking out of the wound (an example of this would be a blood clot). Stage two: inflammatory, this is your body's attempt to get rid of what ever is harming you (although your wound may be inflamed it does not necessarily mean its infected). Stage three: proliferative, this is when your cells divide (one becomes two, two become four,etc.).Finally stage four: remodeling, this is where your body does its best to make everything the way it was before the injury happened.
Now this is just the basic idea of how our skin repairs itself. Imagine if the one thing almost everyone owns, a cell phone, could go through the four natural healing process of our skin and completely repair itself?! I would not be out an iphone all i would have to do is put a band-aid on my sad hurt iphone and POW...healed. Usually the human healing process takes about a week to two weeks, depending on the wound. My phone for instance, would take probably two weeks to heal but it would be totally worth it...wouldn't you agree?!