Crooked smile after chin Botox, is there anything I can do?

Thank you for your question. Unfortunately, Botox cannot be reversed. Your smile is crooked because inadvertently the DLI muscle was hit. You have two options here: You can wait till the Botox wears off in 3-4 months or you can have a few units injected on the other side to make your smile more even. I suggest the next time you have your chin injected using less units and injecting low on Mentalis muscle and away from the lips. I recommend having a follow up with your injector to determine the best treatment plan for you. Best of Luck!

I'm so sorry that you're experiencing this. It's really hard to say how best to manage this without pictures. It is true that once administered, there is nothing that can be done to reverse the effects of botox - it's one of the reasons that it's so important to have a very experienced injector you can totally trust.
Depending on the cause of your uneven smile, sometimes treating the side with less Botox effect can help even things out until things wear off. If your current injector didn't offer this, it's possible it's because your unevenness can't be effectively treated, but you might want to get a second opinion before giving up.