My husband will not clean his teeth properly, but neither will he let me do it. He uses an electric brush and will "scrub" his front teeth, but not very effectively. He never cleans the back of his teeth. They are in very poor condition and the front 2 look to me as if they might not last a lot longer. Is there anything available to help clean his teeth. He wouldn't be able to chew gum and spit it out. He'd probably swallow it. It does worry me, so any advice would be welcome.