What is your opinion in this polishing teeth ?

How much your dentist take for polishing and scaling your teeth ?
In your country
I'm Student in dentistry faculty, This is my 4th year,
I always get nervous when I get around patient because you know 'Not used to be the dentist' I used to be the patient,
http://www.5zen.com/di-JX8R.jpg

Any way This a Picture of what I did for a friend please let me know your opinion honestly ?
and How much your dentist take for polishing and scaling your teeth in your country ?

So Sorry for my Bad English