Google is a search engine that ranks your website in order of importance next to your competitors. While there are hundreds of ranking factors for Google, the content of your website is a big one. When a patient searches online, Google searches through websites to see who's content matches that particular search. The more accurate and fresh the content is on your website, the better the chance Google will find your website relevant and show you higher.
A blog provides continuous fresh content that helps your search engine rankings. It also gives your local audience valuable information which boosts your online credibility, and keeps them coming back to your dental practice for information.