Pomeranian 6 years 6 months old dental cleaning. I'm worried about anesthesia.

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My 6 year 6 month Pomeranian went in for his yearly shots. We finally got a good look in his mouth and found that he has 3 loose teeth. One tooth fell out 2 weeks after his yearly visit so back to the vet on Thursday was told no sign of abscess or infection. I gave him bones used enzymatic toothpaste when HE would allow me yet it didn't work out and I feel terribly about this. He was supposed to go in for a dental last year but I put it off b/c my friends said I was insane to put a dog under anesthesia for a cleaning and I was scared to put him under and didn't know what I know now. Moderate build up on some teeth and he needs a dental. I'm having a consultation w/the vet on Monday and hopefully will have him done next week. He banged his snout a few weeks ago while chasing a cat would that cause the teeth to become loose? Now that's the background here's the issue. I'M DEATHLY AFRAID of him going under the anesthesia. I know tooth loss and decay causes worse problems but I've been crying myself sick and have been ultra nervous about this. I thought I was doing the right thing by giving him bones and brushing with the enzymatic toothpaste but I just couldn't reach all the areas.
I'm afraid he will die at the vets. It's terrible I've lost sleep and can barely eat. I just feel my best friend is going to be lost. Can you please tell me any precautions I can ask the vet to do? I heard certain small breeds don't do well under injection anesthesia and should be given as gas, but on the website it says they pre-medicate with an injection, then IV medication to lose consciousness then gas to keep them under. I heard bad stories about the injections and I'm fearful. This is an animal hospital that is AAHA certified. This isn't a vet dentistry office. Do I need the specialist or am I OK at this vet(this vet also performed my dogs neutering using Isoflurane anesthesia. Does isoflurane involve the injections too or is it just gas? Could his heart and kidneys be damaged?

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Dear Arnold L Goldman, D.V.M., Jennifer Mathis, D.V.M.,

I want to sincerely thank you for the wealth of information that you both provided me with. I greatly appreciate the time you spent helping me. You have educated me and put my mind at ease (I'm not going to lie I'll be a wreck the day he goes under though). I decided that I will have the dental done at the same place that he was neutered because I really trust our veterinarian there especially since we had not one issue with the neutering. I knew waiting this long would not be the best thing to do however I thought his teeth would be OK and thought that the risk of anesthesia was worse than the need(boy was I wrong and I feel terrible about that). I strongly feel that he needs this and it is necessary and just know that it's for his better health and a longer life with me!

We go next week for the consultation and I made a list of everything to ask our Dr. (Most of my questions are addressed on the Dr.'s website but I just want to be sure)

Since he had Isoflurane in the past I'm assuming he was only given gas for his neutering and will ask (if possible) that he receives the same since there were no issues in the past. I'll also ask what our Dr. recommends if that can't be done.

I thank you both tremendously for your responses. I was able to calm down and think rationally about the situation and you both provided me with information to make an informed decision. There was no doubt in my mind he needed this, I just worry so much about him because he is so special to me and the thought of losing him is the most painful thought. I realize now more than before that worse things can happen if you let this go too long.

I pray that his pre-blood-work panels come back healthy. I'm going to be vigilant about dental care after this whether he likes it or not :)

I will update you both once I know more. I just know I'm not going to be able to leave the facility until I know he's done and he's back in my arms with tail wagging. I'm so attached to my boy and the bond we have is amazing.

Thank you both again so very much! Your kindness and helpfulness helped me tremendously.