What Causes Chalky Feeling In Mouth While Having High Calcium Level In Blood?

Hi. I have a chalky feeling in my mouth (similar like when eating spinich) all the time. I have learned this is due to the oxalic acid in the food. But it happens with everything. I do have a high level calcium level (10.6) in my blood, and I m getting that checked currently, for parathyroid tumors...