What is your diet like? What foods do you eat?
For how long time have you been on that diet?
What was your diet like before present diet?
What is your blood type?
What climate do you live in?
How far north do you live? Latitude? How far from equator?
Transparent teeth are a possible symptom of calcium deficiency, which is often a symptom of lack of sun or lack of bioavailable vitamin D.
How much sun do you get? How much oxygen?
When was the last time you have been on a place where air is 100% clean, like a high mountain?