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Aim and Background: The quad helix is well known for its ability to treat posterior crossbites in children with maxillary deficiency. A few authors have also used it for the treatment of unilateral crossbite due to unilateral maxillary deficiency by incorporating modifications in the appliance. The aim was to treat a unilateral crossbite using a newly modified quad helix., Case Description: An 8-year-old female patient had presented with multiple missing teeth and a unilateral posterior crossbite due to an asymmetric maxillary arch. The amount of unilateral asymmetry was measured using a unique method over the cast. A modified quad helix was cemented to treat the unilateral posterior crossbite, and correction was obtained in 30 days. A Nance palatal arch was cemented which functioned as a space maintainer and a retention appliance., Conclusion: The posterior unilateral crossbite was treated successfully with the modified quad helix., Clinical Significance: This article highlights a new modification of the quad helix for treating unilateral posterior crossbite and a new method of measuring maxillary asymmetry. The modification has been termed as a "bi helix" since it eliminates two helices from the classic quad helix design., How to Cite This Article: D'souza OK, Chalakkal P, de Noronha de Ataide I. A Modification of the Quad Helix: The "Bi Helix". Int J Clin Pediatr Dent 2024;17(7):822-825., Competing Interests: Source of support: Nil Conflict of interest: None Patient consent statement: The author(s) have obtained written informed consent from the patient’s parents/legal guardians for publication of the case report details and related images.Conflict of interest: None, (Copyright © 2024; The Author(s).)