Which Online Directory is Most Effective for Local Services?

I’ve been operating a dental practice in St. George, UT for several years, and while word of mouth brings in a steady flow of patients, I believe there’s still significant potential in the local market. I’ve heard that being listed in online directories could help attract patients who are actively looking for dental services, but I’m unsure which platform would be the most effective. With so many options available, it’s tough to choose. Has anyone had success with a directory that significantly improves visibility for local businesses?