Google published a video about what to do get Google to automatically re-index an entire website. When you make major changes on a website, search engines will generally update those automatically over time. Google tends to give high priority to crawling important pages of a website like the home page, which means that linking key pages from important pages is a good strategy. Important changes such as new telephone numbers (and probably street addresses) should ideally be noted on the most important pages of a website. 301 Server Response CodesAdding a 301 redirect when a webpage’s URL changes is of course essential.