We're not going to have enough information about your tooth and situation to know what's needed. Your dentist is in a position to have an idea, and evidently they think that crown placement makes the best plan.

There are two important factors that you should keep in mind:
1) The restoration that's placed needs to be able to create a seal that prevents bacteria and such from seeping back into the interior of your tooth (see coronal leakage link above). Crowns are very good at preventing this.
2) Your tooth probably isn't as strong and fracture resistant as it was previously. (For example, it's been substantially hollowed out during your root canal treatment.)

It's not so much that a filling can't provide a seal and serve as a strong restoration, it's just that crowns do this so much more reliably and predictably. Evidence of this is found in the studies mentioned above. Teeth that have had crowns placed after their root canal treatment tend to have a higher survival rate.

That doesn't mean that all teeth require a crown. It in part depends on how much tooth structure has been lost. In your case, we're assuming that the filling that existed previously was somewhat sizable (a repair large or involved enough that root canal treatment was ultimately needed).

If instead the hole in the tooth is just a small one (and really only your dentist would be able to make this judgment), a filling might suffice just fine.

Ideally the crown (or whatever permanent restoration is chosen) would be placed promptly after the completion of your tooth's endodontic work. If finances or such make that difficult, bring the issue up with your dentist and see if they can offer any solutions/alternative plans (payment plan, placing the crown as soon as your next insurance cycle allows, etc...). Good luck.

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