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3 weeks post op, how long until masseter Botox starts to show?

chubsface44
I received my first botox injection in my masseter muscles to slim down my face almost 3 weeks ago and have seen no improvement. I went in and got a second injection about week ago. How long until I see at least a small reduction in size? Also I feel some soreness around my temporomandibular joint ever since the second injection, could someone please tell me why this is? Thanks in advance for any help!

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