My dad was diagnosed with Alzheimers in 2019 and now lives in a care home. In the last year he has started chewing a lot - bedclothes initially but now he is chewing his fingers. In the last month he bit his thumb so badly that it became infected and he ended up in hospital needing IV antibiotics and then surgery. I understand this is referred to as self-injurious behaviour and we are going to get his teeth checked in case tooth pain is the issue. Does anyone have any experience of this and advice to offer?