Was worried particularly when came on here but it turns out it is valid. If you go to the website https://www. Dental-referrals. Org and use the reference in the text it was a referral that had been done for my daughter. It was for the orthodontist I expected and seems to be a site used by the NHS.
Glad people have responded so I know this is a scam! Pure coincidence but I'm waiting for a referral for my daughter from her dentist for braces! Thought it was dodgy but this has confirmed it!
Had a text sharing a URN for a dental appointment. I have not made any such appointment and no website or other details were provided. This is clearly a scam.