Final answer:
The percentage of patients who have had onset of dental anxiety by adolescence is 50% to 85%. This high percentage suggests the need for early interventions to manage dental anxiety.
Step-by-step explanation:
The percentage of patients who have reported to have had onset of dental anxiety by adolescence is 50% to 85%. Dental anxiety is a significant issue that can lead to avoidance of dental care and resulting poor oral health. The high percentage indicates that a substantial number of people begin to experience these feelings at a young age, highlighting the importance of addressing dental fears early in life to ensure ongoing dental care and oral health maintenance.