Hey guys
As you can see i started this japanese dragon head today now i think i got ahead of myself,i made a dynomesh head then added sub divisions then i added 5 hd sub divions so its now at 274 muillion polys i want to get rid of the bit i painted in red inside the mouth is there a way of doing this or do i have to start over,thanks in advance
regards
274 million?!?!? 
Yeah, you got WAY ahead of yourself.
First, there’s usually no reason to EVER subdivide a dynamesh. You can generally get the resolution you need by using the dynamesh resolution slider.
You could try using the slice tools to cut that mouth section out, but you might run into problems with such a high polycount.
At this point, you probly should look at decimating and/or zremeshing.
Once you get it back down to a reasonable polycount, you’ll be able to select and delete polys, and maybe re dynamesh if you need to.
For comparison, here’s a dragon head I did
Dynamesh = 600K points
hehe i thought i had o well,thanks for replying thor il give that a go i get some into it i forget i should not go further than i need to at the start:D,il get it eventualy thanks again