Here are four things to know about Wakefield, Mass.-based American Dental Partners:
1. American Dental Partners has more than 273 affiliated practices across the country, according to its website.
2. The DSO was founded in 1995.
3. Kevin Trexler is the company's CEO.
4. The company founded the American Dental Partners Foundation in 1999 to improve oral care through dental education and community outreach.