With Delta Dental of Idaho, there is no "open enrollment" period. Employees and their dependents can enroll at any time throughout the year with a qualifying event or when initially eligible for benefits. If there is no qualifying event, then there is a 12-month waiting period on major services only (crowns, dentures, implants, bridges). However, all preventive (cleanings, exams, x-rays, etc) and basic services (root canals, fillings, extractions like wisdom teeth, etc) are available and covered immediately.