The subject of trichotillomania prevention is a sticky one indeed. The main reason is that it's nearly impossible to diagnose the onset of this condition until symptoms have already become apparent. Basically, for instance, if a small child begins pulling his hair out, it doesn't necessarily mean he has "trich", but it may just be a phase that will soon pass - much like when infants and toddlers suck their thumbs.
But if such behavior is looked into, and this condition is indeed the cause, then there you have it. The child has the condition already, and the concept of "trichotillomania prevention" is pretty much a moot point. It can't really be said that it is impossible to avoid, but merely that it's nearly impossible to detect until its presence has manifested and made itself known.
However, if you hope to "nip this in the bud" so to speak, you'll need to be watchful and aware. Become acquainted with behavioral therapy techniques such as the one known as the "behavioral substitution" or "behavioral replacement" technique. This is your best bet, and perhaps the closest you'll get to trichotillomania prevention.
What this does is educate you more deeply into this condition, and the behavior is monitored and perhaps even charted to keep track of it, meanwhile the behavioral patterns can remain as you replace the specific habits (like hair pulling) with those that are much more constructive, but still stimulating in a positive way for the sufferer. This is the most widely accepted form of treatment, due not only to the success rates, but to the non-intrusiveness if this treatment.
Trichotillomania Treatment
For a trichotillomania treatment to be effective, you need to attack the cause. There's no miracle cure-all pill to take care of this problem, and that is due to the condition not stemming from a biochemical root. There exist some medications which are engineered to change certain behavioral activities however this merely produces a temporary fix, if indeed a functional fix at all, for the situation. One should well note that this only produces an effect while you continue to take the medications, only seeming to postpone the condition, not improving it. Obviously, this wouldn't the most prudent course of trichotillomania treatment.
Other techniques of trichotillomania treatment use different types of psychological training methods, which reports show that these actually prove to work rather well... although each of the specific types of psychological methods tend to work better for some than others. However, since this condition has its cause not in biological chemistry, but is rather psychologically rooted, manifesting as behavioral responses triggered by emotional stresses, it is through psychological techniques of trichotillomania treatment that we can more effectually attack this condition at its source.
Developing a universal "one size fits all" trichotillomania treatment that works for everyone has had some rather interesting recent breakthroughs, using a more archetypical approach to psychological methods which can have a permanent effect on everyone. Utilizing these methods and diligently applying these techniques, those everywhere who suffer from this condition have been completely eliminating themselves of this condition and getting their life back. Such techniques and methods are simple, well structured plans of trichotillomania treatment which can be immediately implemented with effects that start to happen within mere minutes and last life long.