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Fused teeth and talon cusp, usually are two separate dental anormalies affecting both primary and permanent dentitions. Fused teeth are more commonly in deciduous maxillary anterior teeth, while the talon cusp is more common in permanent maxillary incisors. Here is a rare case of talon cusp in fused teeth affecting permanent mandibular incisors. We discussed the etiopathogenesis and a possible hypothesis of these two anomalies in order to improve the awareness on the lesion and find out preventive measure to reduce the complications.