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A 'cusp' is an occlusal or incisal eminance on a tooth.
Canine teeth, otherwise known as 'cuspids', each possess a single cusp, while premolars, otherwise known as 'bicuspids', possess two each. Molars normally possess either four or five cusps. Maxillary molars, especially first molars, will generally possess a fifth cusp situated on the mesiolingual cusp known as the Cusp of Carabelli.

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References

Ash, Major M.; Nelson, Stanley. WHEELER'S DENTAL ANATOMY, PHYSIOLOGY AND OCCLUSION, 8th edition.