Quick Answer. An experimental variable is something that a scientist changes during the course of an experiment. It is distinguished from a controlled variable, which could theoretically change, but the scientists keep constant. Continue Reading.
While you were pregnant, your baby developed tooth buds, the foundation for baby teeth (also called milk teeth). Very rarely, a baby is born with a tooth or two, or grows a tooth in the first few weeks of life. But the vast majority of babies sprout their first tooth sometime between 4 and 7 months old.
Age Ten to Twelve. After losing 17 baby teeth, your pre-teen should finally lose the remaining three baby teeth, between age ten and twelve. The upper cuspid and the upper and lower primary molars are the last baby teeth your child will lose. By the age of 13, your child will have most of his permanent teeth; with the exception of his wisdom teeth, which erupt between the ages of 17 and 21. Impeccable oral hygiene is very important during your child's tooth eruption and exfoliation stages.