I see no doubt in this case. The only doubts here are those you have voiced that PF will possibly walk free.
PF beat 103 pound KB, the mother of his little girl to death --- whilst she was blindfolded --- with a baseball bat.
KK, although she is a disgusting human being, corroborates this theory.
So does blood spatter, brain spatter and other forensic evidence.
I'm pretty sure PF's defense will be grasping at straws because all the evidence points to PF as the vicious, murderous mastermind he is.
I don't think the DA/LE/CBI need KB's tooth, the proof will be in the blood/brain spatter, which will be proven by mitochondrial DNA etc that the DA have.
Plus they have KK's testimony. Although she's a rotten human being, she has turned state's witness, filled in some blanks, and I doubt she'd lie because her only focus is copping a plea deal, based on evidence, to save her own skin.
KB's tooth has maybe 1% bearing in this case.
MOO