I read somewhere a few years ago that babies aren't born with the bacteria that causes tooth decay and it is passed on from saliva - I have no source and I don't really remember if that is what it said exactly but it was something along the lines of avoid sharing saliva with your baby at all costs - no sharing toothbrushes, utensils, cups etc. The reason I don't really remember is because I didn't take a whole heap of notice past thinking 'pfft, too late for that already.'
I suppose in an ideal world, it would be good not to share toothbrushes but in reality, it's not that easy to avoid. I also think that I could go to huge extremes now to ensure that I don't pass on germs to my babies but I would have to sew their lips closed to stop them sticking something in their mouth that another person hasn't - they have stuck far worse more germy things in their mouth than my toothbrush

. It's not avoidable for ever. As long as the parents have good oral hygeine themselves, it should help.
ETA: Did a quick google search because I was interested to know if I imagined it and apparently I didn't. Babies aren't born with germs in their mouth, they are passed on. I found this too which might be useful if anyone is interested:
http://www.health.qld.gov.au/child-y...gCareTeeth.pdf
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