Two things come to mind:
1. Does he get enough of vitamin C in his food? Do you get enough vitamin C? Also, the amount of vitamin C that mother was getting during pregnancy pretty much determines what kind of teeth the child will have for the rest of his life.
2. Does he get regular Sugar
in his food? If yes, then that's probably the reason. Most of the food today has some Sugar
in it, and most of it has too much Sugar
in it. Make sure that the only type of sugar he ever gets is fructose. Regular White Sugar
, brown sugar, honey, and starches (white bread, white rice, white noodles, white pasta) are all high glycemic index and high glycemic load foods and have been proven to cause tooth decay.
Obviously, he shouldn't eat ANY junk at all - no cookies (unless they are the organic type with fructose instead of sugar, like you can get at whole foods), no pizza, no regular fruit juices, only freshly squeezed grapefruit juice with some water and fructose, no chocolates, and so on...
Another possibility would be underactive thyroid, but with the child that's less then two years old, I doubt that could be the problem.
Also, I hope his food is rich in nutrients - like fruits, vegetables and so on... including fish, where sardines and california trout are the best.
The damage that was done to his teeth is probably irrepearable; but good news is that he will loose those teeth anyway. In the meantime do add a bit of vitamin C to his food.
Oh, just remembered: flouride is known to do that too! I know it sounds crazy, but make sure you don't give him flourated water, and don't use toothpaste with fluoride. There is "Tom's of Maine" toothpaste that we use - it's called "silly strawberry" and our son loves it. Also, we buy Evian water for him, from glass bottle. Some areas have horribly bad water and tooth truobles are most often connected to the quality of water. That's why you'll see some areas of USA having people with no or very bad teeth.
If you were to increase his calcium intake, I'd stay away from pills, instead give him sardines from a can with those little bones in - they are too soft to hurt him, but are excellent source of calcium, as is yogurt, kefir (we give him kefir and he loves it!), cheese, etc. Yogurt (natural, not the sweet one loaded with sugar!) and kefir should not create any problems for your son, provided you buy the organic kind!