What would cause tooth enamel to be slightly see through?

Question

And how can you reverse/prevent it?

Answer 1

Ask a dentist

could be acid erosion (use sensodyne pronamel to reverse/prevent)

could just be natural.

Answer 2

Well you should ask your dentist help about it. There are some factors why that happen and it's obviously your dentist can diagnosed that. As much as possible try to treat that one.

Answer 3

That’s a calcium deficiency. Try drinking more milk.