Left-handed writing is generally not harmful to the brain.
The brain is divided into a left hemisphere and a right hemisphere. The left hemisphere governs the activities of the right half of the body and is responsible for logic, language, mathematics, writing, reasoning and analysis; the right hemisphere governs the activities of the left half of the body and is responsible for pictures, music, memory, emotions, imagination and creativity. The left hemisphere of a right-handed person is the dominant hemisphere, and the right hemisphere of a left-handed person is the dominant hemisphere.
People who write with their left hand are left-handed, which is caused by genetics, environment, life changes and other factors, and is generally not harmful to the brain.
Left-handed writing is a habit, generally does not cause adverse effects on growth and development, do not have to deliberately correct, should be correctly treated this habit.