Botox Injection Possible on 1 Side of Jaw?

It is possible to inject only one side of your jaw with Botox to achieve better symmetry. The risks remain the same for the treated area.

Botox can be injected into only one side without any problems.  The botox will work only where it is inejcted.

I will inject botox in an asymmetric fashion if a patient as an asymmetric face.  In this way, Botox can be used to make asymmetries more subtle.  

Asymmetries may be balanced by injecting one side only. Some patients who have had medical conditions creating significant differences from side to side can be balanced by treating only one side. Your more active side might be “waking” up quicker than the other side and you may need to get the other side treated soon, also. What you don’t want to have happen is for one side to work and the other not. Such an imbalance might create a malocclusion of the teeth or an improper bite which might cause TMJ (temporomandibular joint) pain which can be quite painful and annoying in the jaw.

Botox injections in the masseter can be very effective. However 5 to 10 units is way to low. You will need somewhere between 40 and 60 to make any difference. Please discuss this with your dermatologist and make sure he/she has experience with unconventional Botox injections. Good luck.

This is one suggested temporary treatment of masseteric hypertrophy. There are many potential risks for asymmetric injection including occlusal disturbances and possible TMJ complaints. However, the risk of this appears to be relatively low from reported studies.
Remember that if the problem is due to a bony condition, Botox will have no effect. Also the Botox must be repeated on a regular basis to maintain the result.