Calcium and pregnant chins.

I had a female that has off white teeth for awhile maybe 5 months. She delivered a baby that was very weak that passed away today. The last 2 months she was given more alfalfa hay, once a week tums, then this week I asked the vet for calcium supplement. My chins are on Purina Chow Show and timothy, unless pregnant or babies. She will go back into breeding maybe 2 to 3 months as long as her teeth get orange/yellowish color.

Someone suggested osterocare (calcium with Vitamin D). She said that Vitamin "D absorbs calcium. I know to much calcium isn't good.

Just want more information about white teeth.