The 5pm crawl on I-285 sets your real service area
Before you choose a single keyword, work out who can reach your front door on a weekday evening.
Dental demand is repeat demand. A patient booking a cleaning is agreeing to make the same trip twice a year, usually after work, usually with a child in the car. Distance on a map tells you very little about whether they will keep doing it.
Twelve miles up the Perimeter at 5:15 is a different trip from the same twelve miles at ten in the morning. Ask the front desk which towns your regulars come from, and which towns produce patients who book once and are never seen again. That second list is the more useful one.
Those two lists, not a mileage ring, are your page plan. Write for the places inside the realistic window. Stop spending words on places where the commute quietly cancels the second appointment.
Elective work does tolerate a longer trip than routine visits do. Keep that split in mind when you decide which pages are allowed to reach across the Perimeter and which should stay close to home.