Can you please elaborate the condition because it is not clear at all what exactly you are suffering from . But if you have a clenching habit that you can opt for night guard . For fractured tooth u need to first go for the IOPA ( x ray) to find the grade of the fracture . If it include pulp thn root canal treatment is must . But it not thn build up can be done . But nothing can be cleared without proper history and clinical evaluation.