Mesh shows seams in game. Not in Blender

I’ve made a mesh head for the online game Second Life. Now it’s almost done but there is one issue i can’t seem to fix. I see seams around the mouth in the game but not in Blender. Am i missing something?


i think i see a decimate modifier (but how would i know? that screenshot is so cropped), that would likely be the cause. copy the object of backup the blend, then apply the modifier, and clean up the mess it left.