Takhlil is ordinarily a sunnah method. But water reaching every required part of a fard limb is obligatory, and a method necessary to achieve that cannot simply be omitted.
If water naturally reaches between open toes, takhlil remains sunnah. If the toes are tightly closed and water cannot reach between them without assistance, ensuring water access becomes necessary for completing the obligatory washing.
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Sunnahs of Wudu and Their Juristic Rulings
Takhlil is ordinarily a sunnah method. But water reaching every required part of a fard limb is obligatory, and a method necessary to achieve that cannot simply be omitted.
If water naturally reaches between open toes, takhlil remains sunnah. If the toes are tightly closed and water cannot reach between them without assistance, ensuring water access becomes necessary for completing the obligatory washing.