Introduction: Children with Special Healthcare Needs (CSHCN) are considered difficult to maintain oral hygiene and challenging for caregivers and dentists to attain cooperation in dental treatment under general anaesthesia. Family Impact Scale (FIS) and Parental-Caregiver Perceptions Questionnaire (P-CPQ) are useful tools to assess patient’s oral health quality of life and caregivers perception. Aim: To assess the impact of dental treatment under general anaesthesia on the quality of life and oral hygiene of CSHCNs, as perceived by caregivers. Materials and Methods: This prospective follow-up survey study was carried out at Dammam Medical Complex, Saudi Arabia, from December 5th, 2019 to December 15th, 2021. The CSHCN of either gender, aged 12 years, and falling within the American Academy of Pediatric Dentistry (AAPD) definition of special-needs patients referred for invasive procedures under general anaesthesia (American Society of Anaesthesiologists (ASA) class I or II), were included. The baseline and, after a one-year follow-up, information obtained from two surveys that were altered from Thompson’s P-CPQ and FIS were decoded into the numeric ordinal scales Never (“0”), Once or Twice (“1”), Sometime (“2”), Always (“3”), and Daily (“4”). Analysis of the collected data was done by Statistical Package for Social Sciences (SPSS) version 20.0. Results: A total of 84 participants were caregivers of CSHCN who underwent dental procedures under General Anaesthesia (GA), of whom 77 (91.7%) were mothers and 7 (8.3%) were fathers of the CSHCN. The mean age of children was 8.29±2.14 years (Range= 3-12 years); 38 (45.2%) were males and 46 (54.8%) were females. The median FIS after treatment was zero, compared to the median before treatment which was 2, revealing a significant impact on being absent from work, a child requiring more care, the impact of presence, sleeping disturbances, feeling angry, feeling guilty, and a child disputing or blaming either parent (p<0.001). Following the pattern of one year post-treatment FIS, median was 0 (Never) for all items including halitosis, pain, food trapped in palate and teeth, swallow, breath, time, sleep, irritable, frustrating, nervous, shy, absent, laugh, and continue school (p<0.001). Conclusion: The modified FIS and P-CPQ evaluations before and after dental treatment under GA revealed a significant improvement in the oral health quality of life for those CSHCN, as well as the impact on their caregivers. Regular check-ups would be useful for early and non invasive intervention without GA.