Evidence of mishap is leading attempt to provide medical treatment (9)
I believe the answer is:
dentistry
But I can't explain it at all! Could you help me understand?
(Other definitions for dentistry that I've seen before include "It's trendy to engage in care in teeth" , "Professional care of teeth" , "Practice relating to teeth" , "It's trendy in profession of teeth-care" , "Medical discipline" .)