Image imported from derpibooru 
Original Description:
 
Doctor Rarity, the first clinician, having captured Rainbow Dash, is now breaking her down with intense hypno-brainwashing until she becomes Doctor Dash, DHD, the second~
 
Ready to serve the Equestria Dental Clinic forever!
 
“DHD” stands for “Doctor of Hypnotic Dentistry”- the very equipment and techniques used to corrupt her, now her specialty, developing and maintaining the technology, while being the greatest practitioner of said techniques in all Equestria. Using it all in service of spreading the gospel of dentistry and oral health/hygiene/beauty, and perfecting all teeth and mouths everywhere~
 
Uploaded before in these places, both with some extensive writing fleshing out even more of the amazing things about this picture and this concept of mine:  
https://twitter.com/sqwrrkpon/status/1423138322797326344  
https://www.furaffinity.net/view/47111572/