for babies, dusting with calcium every feeding is fine, its when dragons reach adulthood calcium dusting should be cut back to a couple times a week at the most. With a proper diet of calcium rich leafy greens, don't need to supplement calcium as much. Egg laying females, however, should still get daily calcium dustings...
Too much calcium can cause excessive calcium build up on bones etc...I can't remember the medical condition or how much calcium is too much...hence I feel its more important to cut back on calcium supplementation after dragons are over 14 months and are not producing eggs. (which use up quite a bit of calcium to shell eggs, fertile or infertile, before being laid)
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PHLdyPayne