Is assisting a dentist who treats both genders without necessity considered a sin if it aids him in performing something unlawful?

The fundamental principle in treating a woman is that it should be done by a female doctor. However, it is permissible for her to go to a male doctor when there is a need, such as the absence of a female doctor or if he is more skilled, while observing the absence of khalwa (private seclusion), the presence of a mahram (unmarriageable kin), lowering the gaze, and limiting looking, touching, and speaking to only what is necessary.

As for a female doctor, it is not permissible for her to treat men except in cases of extreme necessity, such as a danger to the patient's life and the absence of a male doctor. The prohibition is even stronger in dentistry due to the closeness and physical contact involved.

Working as an assistant for a male dentist who treats both genders carries several concerns, including assisting in the treatment of women without necessity, proximity and mixing with men, and the risk of fitna (temptation) when working with a man. Therefore, one must avoid this and seek work with a female doctor who specializes in treating women or who does not treat men except when absolutely necessary.