What prevents jinn and devils from burning human faces now, even though one of them tried to burn the face of the Prophet, peace and blessings be upon him, and this act is not limited to mere whispering?

The Jinn have the ability to harm humans with epilepsy and other ailments, but Allah has provided means of protection from their evil. Whoever adopts these means will be saved from their physical and spiritual harm, and their plots and whisperings will not harm him.