Smiling Looks Odd After Botox In Chin, Will It Subside?

Hi SF.  It sounds like there may have been too many units used.  Tobetter evaluate you, before and after pictures would be required.  But when we are working around the mouth and chin, very small amounts of Botox are required.  We will even accept shorter duration just to make sure we do not encounter exactly the same problem you are describing.  

When you say he injected 10 units as a follow up, this would indicate to us that there was more used initially, which sounds like too much around the chin or mouth.  

It is very difficult to answer your question without first viewing photo's of the facial movements and contour you are describing. However, using smaller amounts around the mouth is generally recommended. It sounds like you may have had too much product injected, and where the treatment was meant to decrease activity in the chin, it probably drifted to other areas causing unnatural and unwanted restrictions.

the added 10 units might have affected one of the depressor muscles of the lip which are revealing their Botox effect not at rest, but when you try to smile. Often in this setting, the other side which wasn't treated, or not treated to the same extent, does lower normally but the affected side doesn't, making an asymmetric mouth shape when attempting smiling.