|Portrayed by||Nigel Shawn Williams|
|First appearance||The Lion's Den|
Don Mercer, DDS, is Luke Collins's former partner at their dental practice, Tooth Tamers.
Luke Collins makes a call to Marcy and Don about meeting up because he has something that he wants to talk to Don about. Don shows up at Luke's home and Luke asks if he wants to buy Luke's portion of the dentistry practice. Don agrees and buys Luke's portion.
- Luke and Don's dental practice is called Tooth Tamers. It is located at 1705 Oakvale Avenue in Rochester, NY, 14527.
- For other uses of Don, see Don (disambig).