The top 10 US websites ranked by the number of visitors:
All but one of the sites is dominated by user generated input or content.
Three of the sites, Facebook, YouTube and LinkedIn are considered Social Media and virtually all of the content is user generated. One site Wikipedia is by definition crowd sourced and all user generated content. Three are search engines, Google, Yahoo and Bing. Search engines gather data from the web in general but nothing happens on a search engine until a user enters input with a search query. Three are shopping sites, Amazon, eBay and Craigslist. All the items for sale on eBay and Craigslist are user generated. The only exception is Amazon.
However even Amazon is highly interactive and features user generated content in the reviews and product evaluations.
Your dental website will never rank in the top ten. However you can make it more appealing by including interactive features like online forms and bill pay. Do not settle for a static online brochure.