Bonded front tooth that had a root canal, feels loose?

I would recommend you return to your dentist for evaluation.  If the bonding is loose this will need to be removed and redone.  If the actual tooth is loose this could be due to a couple of factors.  If there is an infection present this can cause the tooth to loosen.  Since you just had the root canal done it may be that it needs more time to heal or antibiotics to assist.  Also, if the tooth/filling is hitting too high this can also cause the tooth to feel or become mobile.  Either way, have your dentist check.

I suggest you go to your dentist and have a radiograph taken .  Typically a tooth does not just fall out.  The dentist can check the root and see if your bite is ok making sure you are not hitting the tooth too heavy