Universal Precautions are the precautions, according to which all dental staff, working with patient care either directly or not, has to use all appropriate protective wear, such as eyewear, masks and gloves. The gloves are to be discarded, hands are to be washed after each patient’s visit, and a new pair of gloves is to be used for the next patient. These precautions are called universal, as they are to be used for each and every patient with the aim of any infectious disease prevention.
Unerupted Tooth is the tooth, which failed to push through the gum, and thus, it has not assumed its position in the dental arch.

V
Virgin Teeth are called the teeth, which have been free from any kind of restoration, as well as from decay.
Veener is the word, which is applied in the crowns or pontics construction. It is a layer of tooth – colored material, which is usually, though not always consists of ceramic or acrylic resin, composite, porcelain, and which is attached to the surface by direct fusion, cementation or by mechanical retention. 

W
Wisdom Tooth is called eighth tooth from the center of mouth. It is also considered to be the third molar tooth. There are 4 wisdom teeth in every healthy adult’s mouth, though it is not unusual that people prefer to have their wisdom teeth extracted.

X
Xerostima is the term, which is used to describe decreased secretion of saliva, which can produce dryness of the mouth, as well as the burning sensation of the oral mucosa and / or cervical caries.