The services of these valuable healthcare professionals are called upon when a dentist needs to make a denture, or artificial tooth or bridge, for a patient who has lost a tooth due to an accident, for instance, or because of a condition known as pyorrhea in which the tooth becomes inflamed and loosened. In such cases, where the patient is missing a tooth or teeth, the dentist makes a wax impression of the patient's mouth and sends it to the dental laboratory. There, extremely skilled workers can build artificial teeth which will match the missing teeth down to the last degree, in color and size, and in such a way that the new teeth will not interfere with the bite of the patient's other existing teeth.