teeth

After Sonicfox's numerous complaints about the "Joker teeth glitch" I assume we have all heard of the Joker's teeth glitch. Where he does the teeth throwing animation but the chattering teeth don't come out. However, I've noticed a lot of recent joker players not getting the glitch at all. Is...

are there any normal strings into teeth on block that are safe? And is there any formula using the frame data that will tell me? Or do I just have to test them? Thanks in advance.