Show ABOUT 71 etia has been frequently bibdis il for H HEREDITY bad teeth but family foods and other hygiene are at the bottom of this good fortune if heredity were ere an important factor dental decay would never have occurred for time as when it did not exist and certainly bad teeth have not been an aid to survival hereditary tendency should be even more strong ly influential for the production of 0 good teeth than of bad ones it if you have had bad teeth you must blame it upon your parents for not having taken proper care of you in prenatal pre natal period and during the years follow arg our arrival in the world during which yuu yom were not riot personally responsible or upon yourself tor for not riot having been duly careful after you reach the age of discretion 4 it Is to a generally held idea that teeth are formed just before they pop through the guma and ire are ready to assume the duties for which nature obviously intended them that idea is all wrong according to the latest authority we are accustomed to think of teeth as formed at or just before their appearance b 0 it instead of having their begin beginner nir C about the sixth month of the chulds postnatal career they are already building a year eai eat ler ter in the sixth week of his antenatal existence ani stil from this early time right material and right condit conditions lons must be present if they are to be perfect even the second set Is begun long before birth and the first of these to make their at bearance pe Ve arance the six year molars are having their ng ag coat of enamel laid on at birt after the enamel or exposed adamantine coi cohering cring of the tooth whether of the arst or set Is finished its preservation atut still be dependent to some extent on the food the child receives and on lila his general hygiene |