Q. On the bottom left/I have a three piece bridge.the back tooth needed a root canal,so the dr. drilled through the crown….the filling he used was darker than my tooth..it cost me 28oo.oo.my dentist drilled out the dark filling and put in a whiter one..the root must have cracked/he claims i have to now get an implant/and i think he compromised my tooth. what are your thoughts?