the restaurant is not sanitary

[bosunyum]

Can I say like the restaurant doesn't care about sanitary things? or do you have any other suggestions?

[DavyBCN]

Can I say like the restaurant doesn't care about sanitary things? or do you have any other suggestions?

I would prefer health matters/issues or hygiene.

[Ouisch]

The restaurant is unsanitary.

You could then add a sentence explaining why you say this; do the workers not wash their hands? Are there insects in the building? etc.