DNA Polymerase proofreads the DNA during replication before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired. Why is DNA damage repaired before cells enter mitosis? So that another round of DNA synthesis does not have to take place

So that the chromosomes align properly during mitosis

So that the cytoplasm can be divided equally between the two daughter cells

So that healthy daughter cells are produced, allowing the organism to continue functioning normally