On your grandson: I wouldn't worry. Mike
so many times my dtr and I did the same by mistake(couldn't remember which color was mine on the new brushes) and she is negative. just reassure him that he can get tested at the next physical if he is still panicked. GL
I would not worry about your Grandson getting infected. The odds are very, very slim. Especially if you had not used the brush for several hours.
Tony Z
Thanks, that is what I thought.
Why don't you just keep your toothbrush somewhere not even next to the family's. My razor and toothbrush are in it's own case. A pain, yes, but nobody's gonna use them. It's worth it for the peace of mind.