Hi
I love smile month, we do our in Edinburgh hospital, one year I made a big mouth and put OH goody bags inside so kids had pick one, another year I made a big papermache molar and made a giant toothbrush. I work mostly with kids so I went a bit mad. This year we put up a stall and also mixed it with oral cancer advice and raised money for CLAPA so it was good fun we all had our photos taken with this years smiles. Depends what space you have and what time but you can get creative!
Good luck with you planning!