1. Always cover your mouth when you yawn. I'm glad you had dental work, but let's keep that as your little secret, m'kay?
2. Put that dental use to work and smile at strangers, then make eye contact and nod. Connect with others.
3. It doesn't matter what you think or how sure you are...someone is always looking. So, yes, use Kleenex if you must pick in public.
By the way, there's nothing in your teeth.
You're welcome. That's what best friends are for.