Teething is a normal process by which an infant begins to cut the first teeth (primary dentition). The relationship between the eruption of the deciduous teeth and the general health of infants has been documented for over 5,000 years. Various physical disturbances (anything from minor upsets to potentially fatal illnesses) have historically been applied to teething. It is now accepted that the localized symptoms of teething vary between individuals.
On average, infants begin teething at six months and by the age of three years all the first teeth have erupted. A variety of symptoms reported in medical literatures. They include: