People have this feeling that the display of menacing teeth by the reptiles would deter a potential thief forgetting that thieves do not actually come into contact with the pets. They usually study the area where valuables are placed so that they can design the game plan. This would needlessly expose the hapless animal to danger as teeth are impotent in the face of weapons like arrows. Think using sturdy and fixed safes should suffice as well as installing alarms which would be triggered when thieves strike. In some places in my country here in East Africa, some people fortify their premises with charms, amulets and other paraphernalia to guard their premises. Believe me not, scores of people have emerged from disparate locations eating grass and holding the objects they have stolen.
