Objectives: To determine the validity of predicting the combined widths of permanent canines and bicuspids from the bucco-lingual widths of the first permanent molars according to Aboul-Azm and Fouda method in Angle class I cases. Material and Methods: Comparison was done between actual and predicted values of permanent canines and caspids from 22 dental casts. The casts represented Angle class I crowded anterior teeth. The casts related to female patients of age range 14- 16 years. Results: Only upper left side showed significant difference with Angle class I cases. Conclusion: This method is reliable by 75 % to Abou Elazm and Fouda method in prediction of the tooth size material in Angle class I cases.