Why, oh why, can't we give zero stars?
Back when I lived in Cambridge, this was very close to my residence, and covered by my insurance. So I went. They told me my gums were dangerously receding, and that I needed a number of fillings. I got them. My (now-ex) husband also got his very first fillings.
Flash forward about three years. We move to L.A. He goes to the dentist, and learns that all his fillings were put in wrong, and his teeth have been decaying under the fillings. I visit a different dentist about 10 miles away from his six months later and, yes, learn that all the fillings they put in on my teeth were put in wrong. Not only will I need them replaced, but the decay is now so bad under one of them that I'll need a crown. Another tooth they filled collapsed, and I had to get a root canal.
They'll ruin your teeth! Run, don't walk, to someone else.