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Teeth segmentation of dental X-ray radiographs is the important step in teeth recognition. A segmentation to partition teeth from other areas in dental X-ray images. This paper proposes wavelet transform (WT) to segment dental X-ray images. Wavelet transform are small waves located in different time that analyze according to scale. Indeed, they are obtained using scaling and translation of a scaling function and wavelet function. The result of segmentation is a teeth feature marking each pixel. Such as, edges detection from image segmented.