A. Firstly, as you grind/clench at night- you need to sort out this issue with a night bite guard or a stabilistaion splint. Your toot that has been broken can only be restored depending on how much tooth is left – you may need root canal treatment and a core build up with crown. it is difficult for me to say without seeing the tooth in qusetion- so you need to at least see your dentist and discuss what options you have. if the tooth is causing you pain, then this needs to adressed ASAP.