Boiling eggs for a long time will lead to the bursting of eggs, especially for cracked eggs. It is best to choose intact eggs without cracks, put them in a pot with cold water, boil them in water for 3 minutes, and turn off the fire for 5 minutes. If you continue to cook for ten minutes after the water is boiled, you will only cook the eggs older, which will cause some loss of nutrients, and at the same time, the taste will also decrease, and the degree of fat oxidation in the egg yolk will be higher, but it will not produce toxic substances, so you can safely eat them.