If your PowerPoint slides contain all of the information that you intend to present, it's a shitty PowerPoint deck. A slide deck should only highlight the key points you are going to make, or to illustrate your points. The bulk of the information transfer should be verbal, with words that do not directly appear on your PowerPoint slides.
Go watch any professional presentation from a big organization ever. You'll notice most of what the presenter is saying does not appear verbatim on the slides.