Mixed dentition period is the best time to analyse and predict the future dental arch condition thereby preventing any malocclusion that may occur in permanent dentition. During this period one can make accurate and specific prediction of future dental development and also can assess whether there will be spacing or crowding of teeth in the dental arch. In interceptive orthodontics treatment planning, it is important to predict space required and available for unerupted canine and premolars in the arch and this determination of tooth size must be done before eruption of canine and premolars...