Background: Oral health is integral to a child's overall development, affecting nutrition, speech, self-esteem, and general well-being. Despite this, paediatric oral diseases such as caries, gingivitis, and enamel defects remain highly prevalent. Traditional oral hygiene measures, though foundational, often fail to achieve long-term success in children due to poor compliance and limited accessibility. This has led to the exploration of child-friendly, functional nutraceuticals to supplement oral care practices. Aim: To evaluate the effectiveness of JUNIOR SMART—a specially formulated oral health gummy containing prebiotics, probiotics (Bacillus coagulans), essential oils, minerals, and natural sweeteners—in improving various oral health parameters among paediatric patients with different dental conditions. Methods: A total of 200 children between 4 to 14 years of age were enrolled and grouped into eight clinical clusters based on oral health needs: gingivitis, early childhood caries (ECC), deep pits and fissures, enamel hypoplasia, post-procedural care (pulpectomy/extractions), special needs children, children using habit-breaking appliances, and those under preventive maintenance. Each group followed a tailored dosage regimen of JUNIOR SMART Gummies / Candies. Standardized indices were used to measure outcomes: Gingival Index (GI), Plaque Index (PI), Sulcus Bleeding Index (SBI), ICDAS-II, Sealant Retention Index, White Spot Lesion Score, Oral Hygiene Index-Simplified (OHI-S), and Salivary pH. Data were collected at baseline and after the intervention and analyzed using paired t-tests. Results: Significant improvements were noted in most clinical clusters. Children with gingivitis showed reduced GI, PI, and SBI scores (p < 0.05). The ECC group demonstrated a reduction in ICDAS-II caries scores. Enamel hypoplasia and white spot lesion clusters showed evidence of remineralization. Sealant retention was stable in the fissure group. Salivary pH improved across clusters, indicating reduced oral acidity. Special needs children showed notable improvements in overall hygiene scores, indicating high acceptability and compliance. Conclusion: JUNIOR SMART Gummies / Candies, as a functional nutraceutical supplement, proved effective in enhancing oral health outcomes in children with diverse clinical needs. Their ease of use, palatability, and positive clinical effects make them a promising adjunct in pediatric dental care, especially in populations where traditional methods show limited compliance.