Thank you for that suggestion.
I have pierced ears, and even 18 caret sp.? gold irritated my ears, but I could try another metal, or a higher caret gold, or surgical steel, etc.., if the porcelon-based crown material comes from China.
I’ve suffered from an allergy to nickel all my life. The higher caret gold is sometimes tolerable in earrings, but surgical steel works fine. Similarly, I can’t wear any costume jewelry that directly touches the skin. Nickel is a hard metal and is used in combination with many other metals. Even a watch caused problems—I would break out in a rash from the clasp (Now, stainless steel does the trick). I get the same reaction to those silver-colored buttons or grommets on blue jeans.
I never thought about dental products. If you know what the elements are of the product your dentist intends to use, you should be able to do an allergy test beforehand. This site has some good info.
http://corrosion-doctors.org/Allergies/nickelallergy.htm
On a side note, I have a nickel allergy too. I use Simply Whispers earrings. :)