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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