Answer :

Final answer:

Patients with demineralization, narrow periodontal pockets, and exposed dentin should not use an ultrasonic scaler.


Explanation:

All of the above oral conditions contraindicate the use of an ultrasonic scaler. Patients with demineralization, narrow periodontal pockets, and exposed dentin should avoid the use of an ultrasonic scaler as it can exacerbate these conditions.


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