The Er:YAG laser is a type of laser that uses the erbium (Er) ion as the active medium and emits light in the mid-infrared at a wavelength of 2.94 micrometres. It is an advanced technology used in dentistry, cosmetic medicine and dermatological surgery for various applications.

In dentistry, the Er:YAG laser is often used to remove tooth enamel and dentin, as well as to prepare teeth for fillings, crowns and bridges. It provides precise and less invasive tissue removal with less pain and bleeding.

In aesthetic medicine, the Er:YAG laser is used to treat wrinkles, scars, pigmented lesions and skin spots. It can be used to remove the top layers of skin (the stratum corneum) to stimulate skin regeneration and promote collagen production.