Although chronic facial dysfunction can be improved with neuromuscular biofeedback therapy, it is uncertain whether this improvement is maintained after such therapy ends, or whether post-therapy, home exercise programs optimize this improvement. We aimed to clarify these issues. Post-therapy facial function, in 38 previously treated patients, was blindly assessed using the House grading system, 1 to 41 months after ending therapy. Results were compared with pre-therapy function. It was found that post-therapy function was better than pre-therapy function in most patients (40%), it was worse in some (26%), and was unchanged in the rest. This surprising result occurred because, although most patients who recently stopped therapy (1 to 6 mo) had improved significantly, the longer other patients were out of therapy, the more they had tended to deteriorate, particularly those who had been practicing. Results suggested that unsupervised, post-therapy, home exercise programs may be detrimental, and that new post-therapy programs may be required to maintain the benefits of regular therapy.