This second of two articles on diabetes describes the therapy. Type 1 diabetes urges the daily injection of insulin. This hormone is available in many varieties, from fast till slow preparations. In the future it might be possible - apart from transplantation - to install beta-cells in the liver. Type 2 diabetes - often caused by a combination of insufficient insulin production and peripheral insulin resistance - mostly does not require insulin suppletion. Weight loss, diet and exercise are here the basics of therapy. In support, oral antidiabetic drugs are available. Lastly, some remarks are made about diabetes in relation to dentistry.