Hi. I never heard that you need to rest your voice in the days/weeks following an injection. I do know a few people (including me) who will rest their voice for an hour or two after the actual injection procedure. There was one study done on this comparing incessant talking for 30 minutes post-injection compared with absolute silence for 30 minutes. The silence after the injection group faired better. That being said, plenty of people go right back to work, talk away and their results are just as good.Only thing I have heard is that talking in normal voice (not what sounds normal when breathy - just what feels normal) is most logical and beneficial. That is, don't try to yell when you sure as heck can't. Don't make your voice louder than it wants to be, but also don't rest your voice as that will not serve any purpose.
Laurie