Tooth was filed down too much and is now sensitive to cold and heat. What can I do?

I chipped my front tooth and had to get a fake tooth but one of my bottom teeth was hitting my fake tooth and my dentist filed it down so it wouldn't hit anymore after a week I bit into food and it hurt and I had to be careful while brushing my teeth, after a few days it didn't hurt when I bit food now but my tooth is now a bit sensitive to the cold I am so worried that I will have to get another fake tooth because this dentist filed down my tooth too much please help !!!