Ketubot 71: "Place a Finger between Her Teeth"

A puzzle of language. In the context of a discussion about the husband who vows in such a way that his wife is sworn off something to such a degree, and in an unspecified way, that they are supposed to divorce and she gets her ketubah. Namely, the idiom that kicks the oath into effect... Also, a new mishnah! On other vows that the husband might make for his wife - when the vow stands, for how long, and when it leads to divorce/her getting her ketubah. Plus, consideration of the protection of the woman, Ina significant way.