Does Botox stop working? (Photo)

It is possible, though unlikely that your Botox has stopped working. In some cases the body can build up a resistance to the product. The stronger and deeper your lines are, the more active the muscle underneath is and so a greater quantity of Botox may be required to take full effect. How long do you wait before each follow-up? I usually recommend waiting 6 months for my patients, but it may be worth having a check up every four months. Also, how long did you wait before posting your question? Don't forget it can take up to two weeks for results to show. It's possible that your practitioner may have switched their source of where they are purchasing their product from or that it could be 'watered down' so to speak. If they will tell you, find out whether this is the case and how long the Botox is being stored for before use. Alternatively, try another reputable clinic to see if this changes anything. If the results are more effective then you will have evidence that their substance or how they've been administering it has changed in some way. 

Although it is quite rare you can develop immunity to botox.  It is best to not get botox for one year and then try again.

The short answer to your question is that there is some concern that Botox can stop working in some individuals but this would be in a situation where massive doses of  Botox are given for muscle spasticity.  In cases where Botox is used for cosmetic purposes the doses are significantly less.  I would follow up with your injector since you have already paid for the treatment and have had prior success with this injector.  If your doctor is reputable they are likely using legitimate Botox.  If they are not using FDA approved Botox your results can certainly vary.