Diabetic Syringes

I fly to Canada from Dublin Airport shortly. I have a teeth whitening treatment that I want to do. The treatment is just filled syringes, which are capped and do not have a metal pin. If I pack these in my checked baggage, would I be allowed to put them? I'm afraid they might seem questionable in the x-ray .. I still have them in their original packaging, which explains what they are.

Just leave them in their original packaging and put them in your check-in baggage. You will have no problems at all.

There should be no problem. You can pack them, or some of them in your luggage to do if you are in doubt you can show them easily.