Dental Heat hardening is the process done at A Heating 750°C and slowly cooling to zero degrees B Heating quickly upto 450°C followed by sudden quenching C Heating upto 250°C for 15 to 30 min D Heating at 750° C and then quenching to room temperature 💡 Explanation Heat hardening is the process done at ✓ Correct Answer: C. Heating upto 250°C for 15 to 30 min