Saliva plays an important role in oral health. Besides being involved in protection against bacteria and fungi, it transports nutrients and digestive enzymes, lubricates the mucosa, facilitates mastication, swallowing and speech, and acts in the process of tooth remineralization. 1,2 Saliva is produced by salivary glands, which are exocrine, such as the parotid, submandibular and sublingual glands. These are the most important pairs of glands and are responsible for 95% of saliva production. 3 In addition, there are other smaller-sized glands throughout the oral cavity, lips and tongue, which help in the process of salivation. These structures produce saliva at certain moments and respond to a series of sensory, taste and olfactory stimuli.The volume of saliva production may vary according to stimulation. The salivary flow is greater after meals and lower during sleep. In healthy individuals, there is, on average, 1000 ml to 1500 ml of saliva secretion in a day. 3 However, there are several consequences of decreased salivary flow. These include some diseases and problems such as cavities, periodontal disease, various infections, dysphagia, halitosis and difficulties with the stability of dental prostheses. 4 Dry mouth syndrome or xerostomia is defined as decreased salivary flow or hypofunction of the salivary glands. 5 Its origins are multicausal and might be the result of a change in the salivary glands or a systemic imbalance. [5][6][7] Some determinants such as continuous use of medication, radiation, systemic diseases and factors common to aging might be associated with a dry mouth condition. 8 Xerostomia is not considered to be a disease but, rather, a manifestation of a series of pathological conditions that considerably alter patients' quality of life. It can affect chewing, swallowing, use of prostheses and speech. 9 Villa et al. reported that xerostomia that is secondary to hyposalivation may also result in fungal infections such as candidiasis, tooth decay, halitosis, changes to the sense