I disagree. A whole lot of what we include as ECs is not necessarily allo/osteo-related. It would however be something you've spent time and effort doing. 60 hours doesn't seem like a whole lot, but let's say you did 5 hrs/week, that's a whole 3 months of doing something.
Just because it's dental-related, doesn't mean you were dead-set on dental school. In my opinion, if it's your only dental related experience, I wouldn't worry about that kind of interpretation at all. You're simply keeping your mind open to all options while enjoying making a contribution through your volunteering, which is a respectable thing to do.
This is just my perspective.
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