As untreated, as well as untreated, they are the source of microorganisms that can infect indigestion (especially if they are involved in the process of inflammation). If a child loses a milk tooth three to four years before their physiological fallout, then (in most cases) it will cause or worsen the defect of the bite. We have 10 years of milk teeth – we can not spend that time in pain, with an ugly smile and with difficulty in eating and chewing food.