How much notice do you have to give? <a href=" http://iorarua.com/iorarua/index.php?navajo-research-paper#frames ">navajo research paper</a> One limitation of the study is the small number of participants. Nevertheless, a previous study involving more than 4,000 participants and that controlled for several lifestyle factors, such as smoking and alcohol intake found similar results. People with few or no teeth were more likely to have some memory loss, compared with participants who still had many of their natural teeth. That study was published in the journalBehavioral and Brain Functions in 2011.