What is the ruling on taking a loan from an educational bank for root canal treatment, given the high costs in Europe and the unavailability of a less expensive treatment alternative in the home country due to the short duration of the holiday?

If the loan is interest-based (riba), it is not permissible to proceed with it except in cases of necessity that permit committing a forbidden act, such as someone who would perish or come close to perishing if they do not take it. What was mentioned does not reach the level of necessity that permits the forbidden. Therefore, fear Allah and seek lawful means to fulfill your need; for whoever fears Allah, He will make a way out for him and provide for him from where he does not expect.