White spots are the symbol of lower calcium in your body. So you should need to increase your calcium intake to get rid of this problem. There are different types of tablets available to increase the level of calcium in your body. You can take them after doctor's prescription.
Moreover I would like to recommend you take food rich with Calcium, this will improve your health conditions as well. Here is a list of Calcium rich food:
DAIRY
Milk,Yogurt ,Cheese
GRAINS
Cornmeal,Wheat flour,Bread,Cereals ready-to-eat
VEGETABLES
Collards,Rhubarb,Potatoes
Moreover I would like to recommend you take food rich with Calcium, this will improve your health conditions as well. Here is a list of Calcium rich food:
DAIRY
Milk,Yogurt ,Cheese
GRAINS
Cornmeal,Wheat flour,Bread,Cereals ready-to-eat
VEGETABLES
Collards,Rhubarb,Potatoes