White spots on nails are temporary, they grow out as your nail grows, and depending on how fast your nails grow, it can take up to eight months for the Leukonychia to be completely gone.
Nails typically grow about one eight of an inch per month, which can change if you're pregnant or your climate changes. However, poor nutrition, aging and infections are said to slow nail growth.
“Calcium deficiency causing white spots on nails is the most common myth, followed by zinc deficiency. The truth is that white spots are common and harmless and don't indicate any specific vitamin deficiency at all.”