The world of dental marketing is complex and always evolving. The best practices for all strategies from paid ad campaigns to SEO change all the time, sometimes on a daily basis. Unless you hire a marketing superman, one person (or even two people) would struggle to keep up. When you hire an agency to handle your marketing needs, you get a team of experts, usually one per strategy, so one SEO specialist, one PPC specialist, etc. That way, each expert can spend the time needed to remain up-to-date and provide high-quality service every day, even if the relevant algorithm has changed.