"Haven't been to the dentist in 15 years" refers to a situation where an individual has neglected regular dental checkups and cleanings for an extended period. This behavior can have significant implications for oral health and overall well-being.
Regular dental visits are essential for maintaining a healthy mouth. Dentists can detect and treat cavities, gum disease, and other oral health problems early on, when they are easier to manage. Neglecting dental care can lead to more severe issues, such as tooth decay, gum disease, and even tooth loss.