Dental The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about A 25th day of Intra uterine life B 34th day of Intra uterine life C 56th day of Intra uterine life D 20 wks of Intra uterine life 💡 Explanation The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about ✓ Correct Answer: C. 56th day of Intra uterine life