It's more than fine, in many cases. We need the right bacteria in our guts to digest our food properly and they have to get in there somehow. Also our immune sy

It's more than fine, in many cases. We need the right bacteria in our guts to digest our food properly and they have to get in there somehow. Also our immune systems need exposure to a diversity of natural bacteria and other organisms in order to develop and function properly. Lack of exposure to natural biota is strongly suspected to be a major cause of the rapidly growing epidemic of allergies in modern life. (This is the Hygiene Hypothesis referenced upthread.) Not saying you should stick your toothbrush in the toilet, but unusually strict hygiene measures are unlikely to be net beneficial for you. My reading of the research is that greater exposure to bacteria is very healthy and desirable as much as possible without actually getting sick.