Dental Indirect retainers are most effective when: A They rest bilaterally on cingulum of canines B Rest on mesial surface of premolars with extensions on to canines C They rest on incisal edges of canines D Rest on incisal edges of lateral incisors with extensions on to central incisiors 💡 Explanation Indirect retainers are most effective when: ✓ Correct Answer: B. Rest on mesial surface of premolars with extensions on to canines