For hard tissue such as bone, dentine or enamel, hydroxyapatite is the chromophore of importance so that a wavelength such as the erbium:YAG at 2.9 ??m is indicated.Indications: Indications High intensity laser treatment(HILT) Oral mucosal premalignant leucoplakia Mucosal haemangiomatous lesions of the mouth Temporomandibular joint : Division of adhesions, coagulation of redundant capsule in recur