Calcium hydroxide is commonly used to prepare lime mortar.
Calcium hydroxide is as a flocculant, in water and sewage treatment.
It is also used in the preparation of ammonia gas (NH3).
Another large application is in the paper industry, where it is an intermediate in the reaction in the production of sodium hydroxide.
In orchard crops, calcium hydroxide is used as a fungicide.
Calcium hydroxide is used in dentistry, primarily in the specialty of endodontics.
Because of its low toxicity and the mildness of its basic properties, slaked lime is widely used in the food industry.