The Point...

is that even under the duress of extreme indoctrination and Pavlovian behavioral programming, "Bruce" still wakes up to understand (maybe dimly) her captivity and then DESIRES FREEDOM.

I think her desire begins with the forced intercourse --- note her speech to the brother is an objection expressed using film dialogue, an expression from the "outside" of the captivity. She's objecting to that captivity in the only valid language she can use.

Thus, the movie's title: she knows that she has to lose a dogtooth (per the father's mythology) to secure her freedom and chooses what must be amazingly painful self-harm to achieve her escape.

This is a movie about human freedom and the absolute, undeniable urge that pushes one to seek freedom EVEN WITHOUT ANY SOCIAL CONSTRUCTION THAT RAISES "FREEDOM" AS A VALUE. She knows it instinctively, or at least partly so, and partly in response to environmental influence.

This is a powerful movie and reminds me somewhat of the novel "Room".