Child object changes scale

I have a problem that I think was asked before but i could’t find it. I was wandering how can i drag some objects on another object in the inspector without changing their aspect.
I have a mouth object which is a cylinder with changed scale and rotation, and some teeth which are some capsules. When i drag the teeth on the mouth, they look very weird. Is there a way to revert those changes or to drag the teeth without changes?

What you are describing sounds strange…
if the objects are not parented when you change the scale/rotation and then parent them, they should visually not change, the child object however will have its scalefactor multiplied with the inverse of that of the parent so as to keep the same size as it was before being parented.
If of course you reset the child’s scalefactor, it was have the same deformation as the one you put on the parent.