Please answer! what percentage of dentigerous cysts are cancerous?

Essentially none: Dentigerous cysts ( follicular cysts) are benign, non-inflammatory odontogenic cysts that are thought to be developmental in origin. They are the second most common odontogenic cysts after those related to the roots of the teeth They usually present in the 2nd to 4th decades of life and are rarely seen in childhood because they almost exclusively occur in the secondary phase of tooth development .