Final answer:
The succedaneous tooth beneath tooth J is tooth K, which is the permanent lower right second premolar. Deciduous teeth emerge starting at six months, permanent teeth replace them beginning at around six years of age, and wisdom teeth come through in late adolescence or early twenties.
Step-by-step explanation:
The succedaneous tooth that erupts beneath tooth J, which is a primary tooth, is tooth K. The letter J refers to a primary lower right second molar in deciduous dentition, and tooth K would be its permanent successor, the lower right second premolar.
Deciduous teeth, also known as baby teeth or milk teeth, generally start to appear around six months of age and continue to emerge until about the age of three. Permanent teeth begin to replace deciduous teeth around the age of six and continue until adolescence. Finally, wisdom teeth, which are the last set of molars, usually emerge in the late teenage years or early twenties.