The poor thing is so unhappy right now and howls and whines because his mouth is hurting. Toothache is the worse so I can only imagine how he is really feeling and he's letting us know when he's in pain. I hate it! I feel so bad for him.
The only way to help his pain is to help him relieve it and that means him having something in his mouth or chewing on something most of the time. We've found that knuckle bones are a really good thing for Jackson as they keep him occupied for a very long time and he doesn't get bored very quickly.
Another thing that helps him is to be sat next to me on the couch and for me to help him and hold a chew toy in his mouth. He can't seem to get these at the right angles on his own so this means he can get to his back teeth easily. It's a pain in the arse having to hold a toy for him but if it helps them I'm willing to do it.
Jackson's favourite chew at the moment is his DuraChew® Double Bone - Bacon by Nylabone.
There are two different kinds of raised shapes on the white bone bits which help clean teeth. Jackson loves to go from one bit to another and then to the red middle as the texture is changing all of the time, helping to relieve the pain in his gums. I wasn't sure he would like this when I bought it but I'm so glad I did. It's a lifesaver if you've got a teething puppy, especially one as big as Jackson.