Dementia has emerged as a problem to be tackled by various assistive technologies, for example, mobile safety alarms with GPS positioning, fall detectors and adapted internet for social contact. However, persons with dementia are vulnerable, suggesting that such technologies should be used with caution. It is a common experience among care professionals that persons with dementia often show resistiveness to care. This resistiveness is an indication of their vulnerable condition. They are sometimes not aware of what is in their best interest. In this paper I discuss how to handle resistiveness to assistive technologies among these patients. Some assistive technologies for persons with dementia can be beneficial provided that they are used with special consideration of their vulnerable condition. However, it can be a delicate task to overcome resistiveness while at the same time respecting their autonomy. I suggest how this can be done in a stepwise manner. Special attention is given to the concept of nudging. I also indicate under which circumstances some form of coercion might be justified.