Works unless you have an allergy to anything in it.
DON'T, however, EVER EVER use it to glue a filling back in your tooth. I did that once, thinking that it would hold through the holidays then I'd go to the dentist. I'd have probably been alright if I'd actually done that but it held so well I forgot about it for quite some time. Even after the insurance paid their part I still had to shell out $300 for that cap and that was about 20-25 years ago.