Another application of radiography is to examine for the presence of impacted foreign bodies inpenetrating soft tissue wounds. It is not possible to detect by palpation all foreign bodies in the lips, for example, making it essential to include soft tissue radiography if their presence is suspected (see Fig. 2). The exposure should be reduced to about 25–50% of normal hard tissue exposure allowing detection of non-organic materials (tooth fragments, glass, gravel, and similar materials), while organic material such as wood and cloth will not show on the film.