# What is the oxidation state of Calcium in teeth?

What is the oxidation state of Calcium found in human teeth?

• Welcome to Chemistry SE, Kinnard Hockenkull. You can make your question more answerable by telling us what progress you yourself have made in finding the answer to the question. – Aditya Sriram Dec 30 '12 at 7:53
• Ca3(PO4)2 is the compound found in teeth ; the calcium has an oxidation state of 2+ – user2117 Aug 29 '13 at 13:48

I would definitely warn against eating chalk without good reason as it will evolve $\ce{CO2}$ in your tummy and raise your stomach pH, and is associated with a variety of negative health outcomes:
As always, all things in moderation. On a personal note eating chalk sounds like exactly the thing certain sectors of the 'alternative health' crowd would be into (namely, those who assert that the body is 'too acidic' (there's another crowd who claim the opposite and will recommend, say, drinking $\ce{HCl}$ (through a glass straw, natch)), ignoring for a moment the fact that the human body is pretty good at maintaining its pH and will up and have a cardiac arrest or something if the pH drifts more than a bit)