Dental neglect is defined by the American Academy of Pediatric Dentistry (AAPD) as failure of caregivers to provide prerequisites of proper oral function via seeking and timely dental treatment services necessary to be free from pain and infection.. In some cases after pulp therapy, pulp and peri radicular inflammation steadily progresses without any signs or symptoms; thus, long term follow-up of these treatments in primary teeth is essential. But most practicing dentists fail to emphasize the importance of follow up to the parents and patient ,they also fail to report back after their primary dental concern is resolved. Here we are discussing a case of passive dental neglect following pulp therapy in primary teeth which lead to the development of radicular cyst and its corresponding treatment and follow up.