While you can't completely restore it to its original state, you can remove the pills effectively with a fabric shaver. Some battery-powered devices gently remove pills from the surface.
If you don't have a fabric shaver, you can use a safety razor or small scissors. Carefully pull the fabric taut and shave or snip off the pills, taking care not to cut the fabric.
To prevent future pilling, follow the care instructions on the t-shirt's label. Wash it on a gentle cycle with cold water and a mild detergent. Turn the t-shirt inside out before washing to minimize abrasion, and avoid washing it with rough fabrics like towels or denim.
Finally, hang the t-shirt to air dry or use a low heat setting on your dryer to prevent further damage.
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