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Yes, even though no other dental treatment has been carried out and you don't receive Units of Dental Activity (UDA) for the issue of a NHS prescription only, you still need to submit an FP17 form. 

More information can be viewed on the NHS Dental Services website:

Location: Dental Services home page >> Helpdesk >> General Helpdesk >> The National Health Service (General Dental Services Contracts) Regulations 2005 >> Schedule 3 Other Contractual Terms - Section 37