25 units of Botox injected in each masseter muscle but see no difference. Do I need more?

Botox can be used to decrease the bulk of the masseter muscle and therefore narrow the lower face around the corner of the mandible . In order to do that the muscle hast to shrink (become atrophic)  dude to decrease activity secondary to Botox treatment. This doesn't happen overnight. Therefore, in order to see the effect of Botox in masseter: 1) time has to pass and 2) very likely several serial treatments of Botox might be necessary 

Hello,
Thank you
for your question.
It
appears that you may require a larger dose. I'd recommend speaking with your
qualified injector to discuss your concerns and to determine your options.
All the
best.

Botox can be a great option for decreasing the size of the masseter muscle and in patients who grind their teeth.  Generally, dosages range from 20-40 units per side.  It is important to know that the best results from treatment of this muscle will take time unlike treating movement lines.   Over time, due to muscle inactivity, the muscle will shrink with a peak at 4-6 months; repeated treatments are usually necessary to further improvement.

It is not unusual to need a second treatment of Botox approximately 2 weeks after the first treatment to optimize the result for Botox reduction. Be sure to consult with a board certified plastic surgeon or dermatologist. Good Luck!

Thank you for your question.  There are two possibilities for your results, the dosing was appropriate but a single dosing alone is unlikely to lead to significant atrophy, and more regular masseter injections are needed, while the other option is that 25 units was not a sufficient amount of Botox for the masseter and a higher amount would be needed to have effect. Voice your concerns with your injector they should be able to help you attain the goals you want.