OK, so I forgot about what many people call, "Surgical Steel". It is a grade of Stainless Steel that is primarily used for posts for those wearing pierced earrings. The same material is used for 'body piercing' and short term body replacement parts.
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Surgical Stainless Steel is an alloy of iron and carbon, with chromium (12–20%), molybdenum (0.2–3%), and nickel (8–12%). The chromium forms a passivation layer of oxide when exposed to oxygen (air), so even though there is still nickel in the mixture, the chromium forms a layer that is too thin to be visible, which means that the metal remains lustrous. The oxide provides an impervious barrier to water and air, protecting the metal beneath thus it does not react to the human body. Mixtures of these metals are used for short term medical implants but are not considered for longer term (20 to 30 years). In cases where the implants are to be “permanent”, titanium alloys are preferred.
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Titanium is a reactive metal, the surface of which almost instantly oxidizes on exposure to air, creating a microstructured stable oxide surface. This provides a surface into which bone can grow and adhere in orthopaedic implants but which is incorrodible after implant. Thus “surgical steel” may be used for temporary implants and the more expensive "titanium steel" for permanent ones.
Titanium is a reactive metal, the surface of which almost instantly oxidizes on exposure to air, creating a microstructured stable oxide surface. This provides a surface into which bone can grow and adhere in orthopaedic implants but which is incorrodible after implant. Thus “surgical steel” may be used for temporary implants and the more expensive "titanium steel" for permanent ones.
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Since the question dealt with what should you wear in your ears, you could choose either. The titanium however would just cost you an arm if not also a leg….
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