How can I regrown the pink part of my nail and diminish my nail's uneven surface?

Stay healthy. Toe nails grow slowly--maybe 6+months for a full nail...Finger nails much faster. Like all else in your body: good health produces good body parts. Eat well, exercises, check with your doc to make sure no thyroid diseases, kidney diseases, anemia, or vitamin deficiency etc.. Also, avoid traumas to your nails.