Ceramic Flat Iron and Natural Curl

Does flat iron with too hot heat would damaged the curls of natural hair? How to use a flat iron without any hair damage? Here is the detail:

Q: After straightened my natural curly hair with a ceramic flat iron, I lost my curl even after washing several times and it has not come back. Could the flat iron have been too hot?
 
A: The flat iron was too hot and damaged the capacity to hold curl of your hair when you straightening your natural curly hair. Beside this case, you should also consider other signs of damage: brittleness, frizz, dryness and a spongy, matted feeling when the hair is wet.
 
Using the thermal flat iron would indeed damage your hair, the only suitable solution is going to be growing out the damaged ends. Single use of the ceramic flat iron would unlikely caused this hair problem, it is more likely that the damage is cumulative over a period of styling procedures.
 
It is important to make certain that whether you always use the thermal styling tools safely. Flat iron may cause irreparable damage when it is too hot, even if it doesn't simply singe the hair off at the point of contact. The heat of iron should only be as hot as the need to smooth the waves. It is better to make multiple passes with a less-hot flat iron than the one heat too high and damage the hair.