Does cutting a 'v' in my nail cure an ingrown toenail?

No.  The nail is formed by the matrix at the base.  Cutting a notch or ‘v’ in the tip effectively does nothing to change the shape or growth of the nail into your skin.

Dr. Craig H. Thomajan, DPM, FACFAS, FAENS
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Founder and Managing Partner of Austin Foot and Ankle Specialists