Aligners are an excellent appliance to use to treat a variety of malocclusions, but their efficiency in treating severe deep bite has long been questioned. Infrazygomatic crest screws are a powerful accessory that, when associated with aligners, can correct Class II malocclusion using Class I elastics. The biomechanics of distalisation using infrazygomatic crest screws causes clockwise rotation of maxillary teeth, but with efficient planning and the intrusive pressure applied by aligners, deep bite was corrected in the present patient, and the entire maxillary posterior segment was distalised en masse simultaneously. This case report describes the biomechanics of aligners coupled with infrazygomatic crest screws to perform en-masse distalisation and correct severe crowding along with deep bite. Keywords: en-masse distalisation, infrazygomatic screws, aligners, deep bite, severe crowding