Yes, fasting and prayer can be very effective in breaking black magic spells. Fasting helps to purify your body and spirit, while prayer helps to strengthen your connection to God. When you fast and pray, you are demonstrating your faith and commitment to God, and asking for His help in breaking the curse. It is important to stay focused and positive during your fast, and to continue to pray even after the fast is over. With faith and persistence, you can overcome any curse or spell that has been placed on you.