My concern is you have too much medical/clinical experience related to medicine and not dentistry that your application will look like you made the switch last minute. You definitely need more dental related experiences to offset your medical ones. Leaving them out would maybe be wiser but then your application will feel too light and schools will wonder if you just spend your entire college career focusing on grades only, which then doesn't round you out. I wouldn't omit the experience, but definitely need to showcase "why dentistry".
I'd say your volunteer hours are probably a little on the lighter side as well. I recommend spending more time at the food pantry if you can. Shadow a few general dentists. Specialists are cool to shadow, but you're going to school to become a dentist, not a specialist and schools graduate dentists, not specialists, so best to make sure graduating and being a dentist is something you're content with even if you want to specialize.
Applying without biochem is fine, you don't need to have everything completed by application, only by matriculation. Or rather, the spring (May/June) of the year you matriculate.