Teeth Clear At Bottom Teeth Kinda See Through/clear At Tips Of The Teeth?

Teeth kinda see through/clear at tips of the teeth? - teeth clear at bottom

My Top 4 and bottom 4 teeth are visible through the boards a bit, I mean, you can not see through them, but another shadow on the tooth, and is not solid. Who knows how this help? Or what could this be, I asked the dentist just said that everything else thats shadow.