The objective of the study is to evaluate with clinical parameters the performance of Saliwell Crown as a neuro-electrostimulator of the submandibular and sublingual salivary glands in hypofunction status due to polypharmacy or Sjögren's Syndrome in patients with symptoms of xerostomia.

Inclusion Criteria:

• Age range between 18 and 75 years of age
• Clinical symptoms of xerostomia
• Difference in whole salivary flow between resting and stimulating conditions
• Patient ASA type I to III
• Absence of at least one mandibular third molar inferior, but at least partially dentated in the mandible

Exclusion Criteria:

• Patients with antimicrobial treatments in the three previous months
• Smokers
• Intake of bisphosphonates
• Limitation of mandibular opening
• Interoclusal distance smaller than 10 millimetres
• Lack of adequate bone availability for implant placement