Does anyone know if porcelain fillings are safe? Other alternatives?

My dentist wanted to fill my tooth a couple of years ago, but since it is not a cavity and just that it is broken down, I have been putting it off. I recently asked them what kind of fillings they do, they said porcelain. Is this okay? Are there better/safer alternatives? There are a few biological dentists in my city but I'd really like to stay with my current dentist (I've been seeing him since I was 6!) and I think that he does do SOME biological stuff.

Thanks PeteZa, do you know if it is toxic in any way? P.S. your signature made me laugh, so true!

porcelain does seem to be a good option:

www.marzbandds.com/white-porcelain-fillings.html