iirc also our self-defense body's behaviour acts automatic responses when we "miss" something, as like taking some elements or create them from other organs, if

iirc also our self-defense body's behaviour acts automatic responses when we "miss" something, as like taking some elements or create them from other organs, if in need (our organs are also bigger than what is needed, iirc also for those "emergency" states). So if missing calcium, the first places where the organism might take it from, are the tooths -iirc-.