Uneven smile after Botox - will it ever go? (Photos)

Lower face Botox injection is challenging due to complex anatomy when you compare it with  the upper face. DAO injection placement has to be very precise, the injection placement or excessive diffusion of the Botox has caused this uneven smile. Unfortunately there is no antidote, it should be temporary. 
Best Wishes. 
Dr. Shanthala

Thank you very much for your question. I am
sorry to hear about your disappointing experience with Botox. Unfortunately,
when applied by an inexperienced or untrained practitioner, less than desirable
results may occur. From your pictures and description, it sounds like your
dentist improperly placed the Botox, ultimately creating the asymmetrical smile you
are now experiencing. On the good side, the results from Botox are temporary
and will eventually fade away. While most of the results will end in three to
four months, some areas may take a little longer to return to their original
state. As it has been almost six months since your Botox injections, it will be
a good idea to speak with a board certified cosmetic surgeon, who can evaluate
your mouth and provide their reassuring advice.

It would be best to see a board certified dermatologist for an expert opinion as to what can be done for better, future outcomes.   

The asymmetry that you’ve noticed most often resolves within about 3 to 4 months. However, it can take as long as 6 months to completely resolve.   If the condition persists, I would recommend both following up with and making sure that future injections are performed by a board-certified plastic surgeon, facial plastic surgeon, or dermatologist. Best wishes. 

Botox typically lasts 3-4 months, so the effects should have worn off by now.  Since you have concerns that your dentist is not addressing you may want to visit another injector for a consultation.

It seems that your dentist injected you and gave you a droop to that side of your mouth. It will take about two to three months to resolve but it should go away after that.  For the best Botox injections I would recommend you consult a board certified cosmetic dermatologist who injects a great deal of Botox.  Best, Dr. Green

Unfortunately this can sometimes occur after botox injections.  It is important to have your botox injected by a board certified plastic surgeon in order to avoid these complications.  Botox effects usually last about 4 to 6 months.  Since this issue has persisted longer than normal, I recommend you see a board certified plastic surgeon or dermatologist experienced with injections to recognize what is happening and correct the issue.  Best of Luck!

It appears that your Dentist injected the depressor labii instead of the depressor anguli oris muscle causing your uneven smile. The size of the muscle and amount of Botox injected dictate the length of time to resolve. This will completely resolve with time.

one of the good and the bad things about botox is that it doesn't last forever. i'm sorry that you had an unfortunate experience. botox around the mouth can be challenging in the best of hands, and people are very sensitive about they way their mouths feel and function. 
it sounds like your injector was going to the depressor anguli oris (weakening helps to lift the corner of your mount) but may have also treated the depressor labii oris, giving you that uneven smile. it will get better. clearly your smile was even pre-treatment.

Although the botox has worn off in the forehead, it is still working here in the lower lip. I suspect that the botox was aimed at the depressor anguli oris to lift the lip corners, but on the left side became misplaced. Because this is a smaller muscle it may take longer to return to normal, but return it will, so just be patient. You might want to see if your brain can overcome this by looking in the mirror and moving your face. That extra feedback will allow your brain to recruit new muscles to even the lip up until it recovers.