oksana might be lying about mel gibson, part 2

Mel Gibsons ex girlfriend Oksana Grigorieva has been saying that her dentist can attest to the fact that she had broken teeth and bruises on her face, the result of a violent fight with Mel. This is apparently news to the dentist. TMZ says…

Dr. Shelden saw no evidence Oksana was struck in the mouth. 
Oksana told Sheriff’s deputies Mel Gibson struck her in the mouth twice, knocking one tooth out and chipping another.?
Although Dr. Shelden sees no evidence of a strike to the mouth … (he) believes Oksana was struck in the left temple, which caused her to bite down so hard, one veneer was completely knocked out and another was damaged. 
Oksana’s teeth were fully intact … (her) charts reflect two bite marks on the inside of the lower lip.  The doctor says there was no swelling or bruising consistent with a punch to the mouth but believes instead the bite marks are consistent with “a chain reaction” after allegedly being hit in the temple. ??

Now this is just confusing because two days ago TMZ said this very same dentist, “wrote a sworn declaration in which he says Oksana not only told him Mel had hit her … but he was so concerned for her safety he offered to let her stay at his home.”

I guess maybe Oksana just said he wrote that, and was lying, because, short of adding a car chase and a wish granting donkey, these two stories could not be more in direct conflict with one another.