The materials and procedures of the 19th-century lithographer are duplicated in almost every respect by the contemporary hand printer. An image is drawn with tusche (a carbon pigment in liquid form) and litho crayon before the printing surface is fixed, moistened, and inked in preparation for printing. The printing itself is done on a press that exerts a sliding or scraping pressure.
The dream about keys is a dream that refers to solutions to one's life problems. The question you have to ask yourself when you have this type of dream is 'what is the problem I have today that needs a solution, or a key? (read all at source)
Teeth are used to bite, tear, chew and gnaw. In this regard, teeth symbolize power. And the loss of teeth in your dream may be from a sense of powerlessness. Are you lacking power in some current situation? Perhaps you are having difficulties expressing yourself or getting your point across. You feel frustrated when your voice is not being heard.