Primary teeth trauma is very common affecting about 25-30 % of the children with primary dentition. The majority of these cases occur before the age of 4 when walking is not still stable and motor skills have not developed enough. It can be classified in many different types ranging from concussion and lateral luxation to avulsion and from crown fractures to root fractures. Many times primary teeth trauma is left untreated or has delayed treatment usually because parents cannot ascertain the seriousness of the injury or are unsure where to seek treatment. Thus, it is very possible to be missed and also will be missed the effect it may have on permanent teeth. This lecture will review the different types of primary teeth trauma and the management they require. It will also present a series of clinical cases reviewing common clinical signs that led to further investigation which revealed complications after an old primary teeth trauma.