Help with Lemongrab's tooth extraction

In 2019 our vet told us that Lemongrab needs 3 of his teeth extracted, which would be about $300 per tooth, plus he needs a tooth cleaning. Unfortunately, he said that there was no payment plan that we could get on. We haven't been able to afford this for almost 4 years. Recently, he's started drooling a bit so I'm very concerned that the problem is getting worse, maybe causing abscesses or other health issues. We can't afford even a vet appointment to get x-rays or check on the current situation. I did add photos of his teeth to show there is definite gum disease present.