Pine tree roots cut and is now stressed
 

My parents did construction and installed a lawn
during which an older pine tree's roots were hacked off
by the contracters. The construction's purpose was
to fix damage caused by the roots lifting up the
concrete slabs. There are actually two pine trees right
next to each other and the big one is doing fine while the smaller
one is stressing.

Is there any recommended treatment to help the tree
grow back its roots or something.

Stressed Pine Tree

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