If your dog is older than three years it is likely he has some indications of harmful germs and possibly gingivitis. It's important to have your vet check to determine what condition the gums and teeth are in. To know about teeth cleaning you can visit https://www.mapledentalhygienecare.com/teeth-cleaning/
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There are various flavors of dog toothpaste and distinctive dog toothbrushes to make things simpler. Under no circumstances should you use human toothpaste.
Dogs don't understand how to spit it out and the fluoride in the toothpaste isn't great for them.
Also, note that this report applies to kitty teeth cleaning also.
If your dog is an adult, brushing may take some time and practice. To start with, make the experience fun for him and be patient. It may be a great idea to put a little toothpaste on your finger and rub it on his gums and teeth to get him accustomed to the taste.
Spend as short time as likely doing so at first, as your dog hasn't had this done before and if you spend too much time that he might resist.
After a couple of days doing this, you can try again using the identical procedure, this time with a little toothpaste on the toothbrush.
He'll love licking it off and after a few more days that he is going to be accustomed to the flavor and will permit you to begin brushing. It would be better to be routine and exercise daily. Praise him quite often and do not try to rush this new adventure for him.