La educacion para la salud bucal de las gestantes, debe ser una tarea prioritaria de los servicios de salud, tanto a nivel de motivacion, como de formar habitos saludables en ellas y sus futuros hijos. Con el proposito de describir los conocimientos y practicas en salud bucal de las gestantes en control prenatal de Medellin, se realizo un estudio descriptivo con 182 maternas, 161 del regimen contributivo y 21 del subsidiado. El 55.5% de las gestantes asistieron a consulta odontologica hacia menos de 6 meses, y el 62.6% para revision y limpieza. El 68.2% recibio educacion en Higiene Oral en la ultima visita odontologica, especialmente por la Higienista (63.1%). El 28% reporto molestia o dolor en la boca durante el embarazo, principalmente inflamacion o sangrado de encias (51%), sin embargo, el 54.9% no consulto al Odontologo. Para la mayoria de las gestantes (76.3%) ausencia de caries es sinonimo de boca sana, atribuyendole al mal cepillado la caries o inflamacion de encias. La totalidad de gestantes utilizan cepillo dental, el 72% piensan que la crema dental es necesaria y el 92.3% utilizan seda dental. El 42.9% consideran el embarazo como momento de riesgo para adquirir enfermedades orales; un 5.1% lo atribuyen a cambios hormonales. La mitad de las gestantes opinan que deben llevar su hijo por primera vez al Odontologo entre 1 y 2 anos, y muchas de ellas (50%) no estan de acuerdo con antiguos mitos relacionados con salud oral; no tienen claridad sobre los riesgos que pueden sufrir a nivel oral durante el embarazo, tampoco sobre algunos cuidados y habitos orales que deben implementar en su futuro hijo. Identificar las creencias, mitos, habitos y comportamientos de los pobladores, permite comprender como se construye el conocimiento comun y cual es el vinculo entre este y las practicas saludables. ABSTRACT A survey was carried out in order to describe oral health knowledge and practices of the pregnant women in Medellin. A descriptive study was made taking 182 individuals, 161 belonging to the contributory social security program and 21 of a subsidized program were valuated during prenatal controls. Taking into account a maxima proportion from variation of 50%, a level of confidence of 95% and an absolute precision of 10%. Two pregraduated dental students, well trained made the interview, and verified by the principal researcher. 55, 5% of pregnant women had a dental appointment less than 6 months ago and 62, 6% attended for check up and cleaning. 68, 2% received education in Oral Hygiene during their last dental visit, mostly by hygienists (63.1%). 28% reported annoyance or pain in their mouth during pregnancy, with inflammation or periodontal bleeding being the most common 51%; despite this, 54,9% did not visit the Dentist. Most women (76.3%) considered that absence of decay was synonymous with a healthy mouth and attributed the presence of decay or inflammation of gums to the lack of brushing. All those surveyed used a toothbrush; 72% considered that toothpaste was necessary and 92.3% that the used dental floss. 42, 9% consider pregnancy is a risk period for acquiring oral diseases, and only 5,1% attributed it to hormonal changes. 50% thought that it was important to take their child for the first dental appointment between 1 and 2 years of age, and many of them (50%) are not in agreement with old myths related to oral health; they do not have clear the oral risks they could suffer during pregnancy, neither some cares and habits that must be implemented in their future son. To identify the beliefs, myths, habits and behaviors of people, allows to understand how the common knowledge is constructed and which is the bond between this one and the healthful practices.