Re: teeth gaining its white back?

yes, teeth can remineralize.  it can be done with diet and/or topically applied products.  sometimes small cavities will remineralize.  i am sorry to tell you, human teeth do not regenerate.  if they did, you would need a hard chew toy to keep them from growing through your skull.  rodents, rabbits, and horses teeth grow throughout their life.  since you are typing on a computer, i don't think you fall into any of those categories.  be careful with using hydrogen peroxide all the time, as it can make teeth sensitive. 

your bones store minerals used for the body.   

Remodeling

Remodeling or bone turnover is the process of resorption followed by replacement of bone with little change in shape and occurs throughout a person's life. Osteoblasts and osteoclasts, coupled together via paracrine cell signalling, are referred to as bone remodeling units.

 Purpose

The purpose of remodeling is to regulate calcium homeostasis, repair micro-damaged bones (from everyday stress) but also to shape and sculpture the skeleton during growth.

 Calcium balance

The process of bone resorption by the osteoclasts releases stored calcium into the systemic circulation and is an important process in regulating calcium balance. As bone formation actively fixes circulating calcium in its mineral form, removing it from the bloodstream, resorption actively unfixes it thereby increasing circulating calcium levels. These processes occur in tandem at site-specific locations.

 Repair

Repeated stress, such as weight-bearing exercise or bone healing, results in the bone thickening at the points of maximum stress (Wolff's law). It has been hypothesized that this is a result of bone's piezoelectric properties, which cause bone to generate small electrical potentials under stress.^{[citation needed]}

 Medical conditions related to bones

• Bone fracture
• Osteoporosis
• Osteonecrosis
• Osteosarcoma
• Osteogenesis imperfecta

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