Where can I find out the value of some vintage toothpaste ads I have from 1900's?

Answer 1

. I can't imagine there being much of a demand for such a thing. Have you tried to locate the same thing on ebay?
They have some for $3 up to $15.
If you have some kind of art colector or antiques in your area, ask him.
There might be someone like in New York where you can send them an emailed photo.