Neuroplasticity is the brains ability to rewire itself. The brain can change or alter connections at any time to create physical, psychological or emotional healing. Under hypnosis, the brain can be directed to make those changes taking away the huge effort it requires to consciously change ingrained habits and behaviours.
The unconscious mind has 2 jobs. To move us away from pain and towards pleasure and to make life as easy as possible. To make life easy, it quickly learns new habits and behaviours that we adopt and once we have repeated an action a few times, it starts running that action on automatic pilot. This is great news when we are learning a skill such as driving, but it is not great news if we are repeating behaviours or thought patterns that are not healthy for us.
This is why willpower does not work. We use willpower to start a new healthy behaviour but before we know it, we are right back to where we started. That is because willpower is using our conscious mind to over-ride our unconscious mind. Our unconscious mind runs on automatic pilot so to consciously try and over-ride that is exhausting. The best way to make change at an unconscious level is to direct the unconscious mind to behave in a way that is more healthy for us, thereby making change with ease and without effort. This can be done through hypnosis.