I donīt really know about the dental check. But I think that it is imortant that Your teeth are healthy and have white natural coulor when You smile.
I am sure there are alot of cabin crews that have fillings .
And what about Your weight... It is difficult to say, because nobody knows what exactly does EK want. If You look normal ,not too fat and not too skinny....If You look nice and attraktive ,and confident with Your 85 kilos..it must not be a problem.But I canīt say You exactly. And what is Your personal feeling about Your weigt? Some people with 175 cm and have 85 kilos...but they look very different it depends on Your figer and so on. Just try....You will never know till You visit the Open Day.
Wish You good luck as well!
