How should I trim a birch tree to ensure its health and longevity?

To trim a birch tree for health and longevity, prune dead or diseased branches in late winter or early spring. Avoid cutting too close to the trunk and make clean cuts at a slight angle. Do not remove more than 25 of the tree's canopy in one year to prevent stress. Regularly inspect the tree for signs of pests or diseases and address any issues promptly.