Hi Angie, Believe it or not, even after 30+ years as a certified dental assistant, I am still the worst patient! ☺️ Things that help are wearing earbuds and listening to music while you’re getting treatment. You can also ask for a prescription for a mild anti anxiety med like Lorazepam for the appointment.

Now, down to the nitty gritty. What you’re talking about is actually called an Immediate Denture and they’re not at all uncommon. Most patients don’t want to wait until the mouth heals and bone modifies before they have replacement teeth. So immediate dentures are one of the alternatives to having teeth right away.
Having teeth extracted and then inserting the denture actually helps keep swelling down and protects the gums and bone tissue while it heals.

However, there will be modification in the mouth over the next few months as the gums and bone shrink naturally after losing the supporting teeth. So you will most likely require what’s referred to as a Reline, where the denture gets a new layer of material to help them conform to your tissue so they fit better. When the dentist feels the changing has slowed, then the permanent dentures can be made.

Here’s a good article that tells you about temporary immediate dentures and what takes place. https://www.healthline.com/health/immediate-denture

Now, when you get those dentures and need to take them out the first time or so after the extraction they may be a little icky inside. So remove them over the bathroom sink. BUT~Put water in the sink first in case the dentures slip. That way the water will break their fall and the denture won’t chip in the sink.

Ok, most importantly is the MM aspect of this. That can complicate things a little and I don’t want to add to your anxiety but you need to talk to your hematologist oncologists before going ahead with this procedure.

They may have guidelines for your dentist to follow such a prophylactic antibiotic and a medicated mouth rinse before any procedure.
There should be current oral X-rays taken so that the dentist and your hematologist can make sure there isn’t any bone involvement that could hinder healing or cause excessive bleeding.
They’ll also need current blood work to make sure your platelet level is normal so that there’s no excess bleeding
They may take you off any Biphosphonates, if you’re taking any bone building medicatio, before you have the extractions so the bone heals.
They may also consider whether you’re in remission right now or in an active period of your MM.

How many teeth do you need to have removed? Are they fairly loose already?