Is the wood treated with anything/have any kind of finish? Also, is there any safety testing for glues used?

Hi, Thanks for your question. The brush handles are finished with non toxic protection varnish. The products are safety tested and passed in accordance with necessary US guidelines. Please feel free to send me a direct message if further information is required. Sarah

Is this made in the USA?

Hi, Thank you for contacting us. We reviewed many suppliers as quality is key for us, this product is made in China. Thanks Sarah

Can you use it on wet hair? Will the brush start to smell? Can you wash the brush?

Sure, you can use the brush on wet hair. Just be sure to let it air dry completely before putting it in a closed space. You can wash the brush with shampoo and water, rinse it thoroughly, and dry it with a towel. Let it air dry completely, with the bristles down or stand it in a cup to dry.

Is there writing on the brushes or just the comb?

Both brushes and comb have written engraving in them. The font is cute though so it doesnt look terrible. It reads "little tinker's world" on all of them.