**4. Brachytherapy**

Brachytherapy is the delivery of radiation therapy using sealed sources placed within or close to the site to be treated. Oral cavity cancers with their ease of accessibility and better visibility had provided the best sites for use of this therapy for improved local control and outcomes in the past. With its ability to give high doses to tumour and very minimal dose to the surrounding tissues, brachytherapy could be considered the most ideal conformal therapy. However, in recent times the technological advancements associated with external beam therapy, improved imaging and surgical techniques and lack of appropriate knowledge or expertise in invasive implants has relegated brachytherapy to be used in very specific and not so common indications of these cancers. Modern brachytherapy too has evolved to
