Sidney Dental Office Big Sky Smile Center Address: 821 South Central Avenue Sidney, MT 59270 Phone: (406) 488-3536 Email: Office Hours: Monday 9:00am to 4:00pm Tuesday 9:00am to 4:00pm Wednesday 9:00am to 4:00pm Thursday 9:00am to 4:00pm Friday 9:00am to 3:00pm