Dear Lybrate user, any tooth after root canal treatment loses a lot of it's natural structure and becomes weak and liable to break/fracture. That's why we put cap over it to protect it from excess forces and accidental breakage. If your cap is broken, I would advise you to get a new one immediately to avoid any further damage.
Please don't think of it as the crown given after RCT is meant to support and strengthen the tooth! If you do not get your crown placed within 1 week, then due to physiological movement of teeth and gums the crown won't fit back on your tooth. You will have to pay and get a new crown made and worse your Tooth might fracture due to chewing forces.
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