Your children spend many hours of the day with pencils. The wood of non-standard pencils is usually not cooked to make it cheaper, so there is a possibility of its contamination with all kinds of microbes, fungi and parasite eggs. But the wood with which standard pencils are produced is definitely baked during thermal and chemical treatment and all its impurities are removed. Some children have a habit of putting pencils in their mouths so for the health of your children, use only standard pencils.