The first screen has to answer whether you are open when their shift ends
Availability is the first question in a round the clock city, ahead of credentials, technology and philosophy of care.
The visitor arriving on your homepage at eleven at night is deciding one thing: whether you are a practical option. Hours, location, plans accepted, and a way to book. Everything else in dentistry is a second screen concern.
So put the actual hours in the first screen, in text, with the days named. Not in a footer, not in an image, not inside a widget that renders late. If you have early morning or Saturday availability, that is the most valuable sentence on your site and it should not be competing with a rotating headline.
A practice open only weekdays until five is still fine. Say so plainly and let the visitor decide, because a wasted call costs your front desk more than a lost click costs you.
Then give the booking path directly under it. One tap to call, one tap to book, both visible without scrolling on a normal phone.