After the proofreader has done her work, reputable publishers will send you page proofs. (In the typewriter days, we called them gallies and they were printed on one long sheet of paper.) These days, the page proofs show us what the interior of the book will look like.
Read your manuscript carefully. Computers sometimes goof on syllabication. Most publishers still print their books with a justified right margin (but you send in your manuscript with what we call the ragged right). The computers sometimes make what we call BB—bad breaks—by hyphenating words already hyphenated.
For example, self-conscious might be divided to read self-cons- and the rest of the word on the next line or even on the following page. The rule is that we never break a hyphenated word at the end of the line except where the hyphen already appears (self-).
When you receive the page proofs, you'll also receive a note saying that if you want to make any significant changes, you, the author, will pay for them.
The page proofs normally come in jpeg and they'll explain how to make those minor corrections.