If you have ARS Humano, give them a call and they can add it easily.
If not, speak to whoever you use for health insurance and ask if they can add it on.
Moca or Santiago? I guess it depends on what times and days various dentists etc are at various clinics. You need to check. Moca is also a very nice clinic.
Their root canal specialist is Enrique's sister, Maria. She's isn't just good, she's excellent.
She also teaches at PUCMM I believe, so you will need to find out her schedule.