Horrible, horrible misunderstandings about hypnosis and bad hypnotherapy to boot. Please work on that.

First off, the "hypnotist" is actually a dentist, not a professional and experienced hypnotherapist. But he has had a little hypnosis training. 

Second, he starts by telling the subject that she will probably fail! 
Hypnosis is very sensitive to expectations put there before a session. In a sense, a session has already begun the first moment the therapist speaks to the subject.
Guess what? The session fails to achieve the desired change, probably simply because the subject was told it probably would fail!

Third, the subject was not given any exercises or "homework" as I call it, to strengthen and build a new response into a habit. Without such a structure in place, any bad habit is   likely to resume after a brief halt. 
I give all my online therapy subjects homework consciously, or unconsciously implant it.

Professor Jay Tee, Master Hypnotist
http://superunconscious.com