inverted elements in gambit
 

I have been meshing a fluid domain consisting of elements to order of 2.5 million. Now found that last volume being meshed contains 1 inverted element & results in negative volume. It's not possible to revert back from starting the mesh again. Is there any means to suppress the inverted elements? or are there any commands to smoothen the mesh which can lead to better results. Please note it does in gambit.

Thanks in advance. Abhijit Kulkarni.