Blender modeling: To sphere tool does not rounded the face of model I am beginner of Blender.I faced some problem as I try to modeling the tongue. I am trying to make the face become rounded but when i use sphere tool there is nothing change neither using loopTools to circle the faces (the faces will deleted)I dont know why this happened. 

Can anyone tell me how to solve this?
Thank you in advanced for those who reply.
I found the solution by luck. Actually i forgot to click on the adjust edit cage to modifier.