Harvey sounds like a wonderful boy!
I'm going to start with the information you least want to hear, and move on to the more optimistic.
Loose teeth may or may not fall out on their own. Since they are quite "wiggly" and at an odd angle, my guess would be that with time and chew toys, they will come out. I've seen some stay in forever, and one dog regained stability but as I understand it, that's not the norm. It would be better, really, for the teeth to come out. If left in, they increase the risk of infection and abcess. Infection and abcess in the mouth can QUICKLY become systemic and very serious. No matter what, you'll have to monitor for signs of infection. I'll put info about that a little farther down. If the teeth come out FULLY, root included, the space can close. You still run the risk of infection, obviously, but you can stop being as vigilant after awhile.
Normally, I say RUN to the vet, have the teeth extracted, the area sutured and be done with it. However, I fully and totally understand how difficult vet bills can be. I think 99.9% of the population would have a problem with an unexpected vet bill, so I hope you don't feel badly about it. That you are willing to search the internet and give your dog hands on care (in addition to providing a home for a deaf dog) speaks volumes about you as Harvey's human.
If he were mine, I would give him chew toys (the tuggy ropes, nylabones, I'm not a big fan of rawhides) and watch and wait. It will take a lot of vigilance on your part. You need to closely monitor for signs of infection - the area will be red (I know it is now, but I'm talking about a spreading red), possibly there will be swelling. You may notice Harvey develop bad breath. If you tap on the tooth and he experiences pain, that can be an indication of infection also, since he shows no signs of pain when you do that now. Watch for lethargy, keep an eye on his temperature. If and/or when the teeth do fall out, maintan the same level of vigilance as before. Especially if you are not certain the ENTIRE tooth, root included, has come out. If/when the teeth come out, you'll want to rinse the cavities several times a day so no kibble pieces become lodged and cause infection. When the area has healed, you can relax.
In the meantime, if he appears to be in pain, you can give him the aspirin. Do try to limit the frequency, because too much aspirin over time can cause gastointestinal problems and harm the liver. Also, only give it to him when you'll be home to watch him.
Should Harvey develop an infection, he WILL need vet care. As I said, an infection in the jaw can quickly become devastating.
So, below is a list of organizations you can contact through the internet. They assist with veterinary medical expenses. Some do require you to apply to Care Credit, which is basically a credit line to pay for both human and animal medical bills, http://www.carecredit.com/ and be denied before they consider your application. I know a few people who have used care credit and they said the payment plan was pretty reasonable. Most vet clinics will also work with people to set up payment plans, etc. It's always worth the call.
American Animal Hospital Association
" Through the AAHA Helping Pets Fund, veterinary care is possible for sick or injured pets even if they have been abandoned or if their owner is experiencing financial hardship."
Angels 4 Animals
"Our services range from financial aid to complete treatment
to those pets and pet owners in need."
"Our efforts focus on serving the elderly, the disabled, and the
"We are dedicated to insure that no
companion animal has to be euthanized simply because their caretaker
is financially challenged."
"The Pet Fund is a registered 501(c)3 nonprofit association that
provides financial assistance to owners of domestic animals who need
urgent veterinary care."
United Animal Nations
"The m ission of LifeLine is to help homeless or recently rescued
animals suffering from life-threatening conditions that require
specific and immediate emergency veterinary care. We strive to serve
Good Samaritans and rescue groups who take in sick or injured
animals. In certain cases, LifeLine can also assist senior citizens
and low-income families pay for immediate emergency veterinary care."
I hope sincerely XXXXX XXXXX goes will with Harvey. He sounds like a wonderful companion. Please let me know how he does!!