• CLASS I: Bilateral edentulous areas located posterior to the remaining natural teeth
• CLASS II: A unilateral edentulous area located posterior to the remaining natural teeth
• CLASS III: A unilateral edentulous area with natural teeth remaining both anterior and posterior to it
• CLASS IV: A single, but bilateral (crossing the midline), edentulous area located anterior to the remaining natural teeth

There are two more Classes added to Kennedy’s classification which are – 

• Class V: An edentulous area bound by teeth anteriorly and posteriorly, but where the anterior tooth is not suitable to be used as an abutment. 
• Class VI: An edentulous situation where the bounded teeth are capable of total support of the prosthesis.

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