Possible Clues:

• Reduce support in honest mistake and gain experience
• Gain experience - you might have to do this if you want to get an interview at the dentists? (3,3'1,5)
• Would you need to do this to visit the dentist in practice? (3,3'1,5)
• Shady types in version of the film take drugs - half of them to gain experience (3,3'1,5)
• Practice copper's ringing tone on local choppers (3,3'1,5)
• Blood test out, hence got dressed