Dentist says my teeth are OK but...

[RBev]

I have seen my dentist and he said that my teeth/enamel is fine. If I look under the light I can see craze lines. I get really insecure when my tooth temporary decides to have a weird pattern at the bottom of my front tooth; it looks like it goes an off white translucent colour in the shape of mountains and changes back to its normal self when I am not outside. It doesn't do this all the time. I am not sure what to do.

If the dentist says it's ok, it's okay! I bet nobody else has commented...

I’m not exactly sure what you mean. Your dentist will be looking at the strength of the enamel and whether it has been eroded surely? What you’re describing sounds cosmetic and like it can only be seen in certain lights.
My teeth have weird patterning on. I can’t remember whether it’s due to fluoride supplement or a childhood illness. They’re not pearly white but they are healthy enough.