Dental All of the following about use of aerotor hand piece are false except: A The sound frequency greater than 75 decibel (dB) causes damage to the ear B The frequency of rotation of bur is 6000-8000rpm C It will harm more in elderly than very young D Its use in younger teeth is contraindicated. 💡 Explanation All of the following about use of aerotor hand piece are false except: ✓ Correct Answer: A. The sound frequency greater than 75 decibel (dB) causes damage to the ear