The usefulness of things like tables of contents, cross-references, index entries and so forth relies on whether they lead to the right pages.
You can automate the creation of these document elements, but it’s a good idea to refresh (or update) them before you share documents.
One easy way to make sure the numbers get updated before other people see your document is to set Word to update these elements (collectively known as fields and links) each time you print the document.
First, set your printing options in Word’s Options dialog.
Once you do this, links will be refreshed each time you print. Have a table of contents? Word shows the following dialog before you can print:
