Now we have waited two weeks for your question, you should have full effect of Botox effect. Here is my answer to your questions: 1. there are several FDA approved Neurotoxin on US market, Botox, Dysport and Xeomin, some times they are all mixed in name been called "Botox". Dysport usually works faster than other two. One day onset is bit unusual, but it's not impossible. 2. 20 Units for chin is much higher than I would give to my clients, I usually give 6 units, but again it depend on individual, however, you should ask if you get Dysport instead of Botox, because Dysport Unit is higher than Botox, usually 2.5 Unit of Dysport is equalent to 1 Unit of Botox, which means you only get about 8 units of Botox equivalent. excessive amount of any Neurotoxin can cause asymmetry of chin or even leaking water when you drink 3. once neurotoxin is injected, it is hard to get rid of no matter what you do. Warm compress may help somewhat in denaturing of the protein immediately after injection.
I hope it help your question
sincerely yours.
D. Zeng MD PhD