Question

what is buccal cavity

Answer 1

Buccal cavity is opening of alimentary canal which  leads to the pharynx and to the oesophagus.

Answer 2

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A buccal cavity is usually in the groove going from between the cusps (points) on the molar and the gum line on the surface that faces the cheek. So a Buccal cavity refers to the place the cavity is located not the type or severity of the cavity.