GP3 has stopped eating.

[Stillwaitingforthesummer2come]

He's lost a lot of weight and will nibble on cucumber but that's it. Taken him to the vets today and got metacam and something to aid his digestion and get things moving. Vet has recommended taking him back tomorrow for a sedation to look at his teeth properly and file if needed.
Are we then letting ourselves in for many teeth filling sessions if that is what the problem is? Will he need sedating every time?

My Old Boy (RIP) had a few dentals and yes knocked out each time. Eventually i.e. too late vet found a lump in OB's neck and he went blind on the same side.

I'm guessing vet has given you fibreplex an orange paste to get the gut working. Ask vet for critical care too but IME guinea pigs hate it.

In the meantime mash up your guinea's dry food pellets with a little cooled boiled water and feed it off your fingers. I feed my guineas Burgess Excel and OB loved it mashed and very finely cut carrot sticks.

How old is he?

He's probably managing the cucumber because its quite soft but also juicy so he's getting fluids too.
Is he dropping food or dribbling out of his mouth? (Hard to tell with cucumber it makes them spit everywhere anyway)

They'll be able to get a retractor in and have a good look at his back teeth so if there's a spur or a wound they can see it when he's sedated and not resisting.
Once he's filed, unless there's any jaw malalignment , his natural chewing should keep them worn.
Once he's done, make sure he has plenty of fibre (hay is best) to keep his jaws chomping.
But in the meantime, YY to sloppy mashed pellets. You can use the end of a teaspoon to put tiny amounts just behind his teeth (Make sure he chews the spoon a bit then you know he's swallowing. same with the Fibreplex )
We had Fibreplex for our GP3 , it was in a syringe, you push to get a doseage but its quite tricky to insert it into the mouth and push. 2 person job.

Good Luck tomorrow.
If there's a tooth problem he'll feel a million times better when its sorted..

He's 2. I think it is fibreplex he's been given. Vet couldn't see into his mouth as it was full of chewed up food, hence the medicine. GP likes both meds though!
He doesn't seem to be dribbling, but is very sorry so I'm guessing in some pain that he's not cleaning himself as he usually would.

Not sorry, dirty!

Since coming back from the vets today and having the meds, he's drank about a quarter of a bottle of water which I'm assuming is a good sign

It is a good sign :)
How is he today?

He had all his teeth filed / cut back yesterday under sedation. Vet said he was perky on waking up, but he's been really quiet since. He's eaten some mushed up pellets off a spoon this morning. Fingers crossed he'll pull through x

If he is eating that is a good sign. Good luck :)