How do I know if my brow lift failed?

At 5 weeks if your brows have returned to their preoperative position, then I would agree that the operation has not been successful.  It is normal for the brow to drop partially, and the results can be subtle, but of course their should be an effect, and I work hard to have patient expectations meet what I can achieve.  Every surgeon has their own policy on how to handle revisions, and so you need to discuss that with your surgeon.  A common policy is to do revisions without a surgeon's fee, but the operating room costs are the responsibility of the patient.   Every case is different though, and often surgeons will handle each individual case in a personalized fashion. Best of luck in your discussions with your surgeon.

It sounds from your description as though your endotines may have become dislodged before the tissues could heal into place.  I have been able to replace the endotines under local anesthesia in the office, but you may require a return trip to the OR if this is not a viable option.  Each surgeon has their own policy regarding revisions and cost, so I would touch base with your doctor.  Generally, procedures in the office are much less expensive that those done in the OR.  Best of luck