Hi green,
thank you for your ideas.
The concepts I like are #20,22 and 23. My initials (OD) are not that important. Maybe you have some more ideas regarding the signs without the two points.
The tooth in the circle looks good.
Maybe you could use another color besides the blue one.
Could you also use a similar font like the one you used for sterling, suave olens or pacific alliance?
Thanks again for your work!