Photodynamic Treatment as Part of Oral Healthcare on Persons With Sjögren's Syndrome

Inclusion Criteria: * Adult (minimum 18 years of age) person with Sjogren's syndrome, with dry mouth symptoms but some saliva secretion. * Otherwise perceived health good, primary Sjögren's syndrome patient. * No need for antibiotic prophylaxis at the time of a limited oral examination. * Signed written informed consent. * Subject's co-operation allows participation in the study. Exclusion Criteria: * Pregnancy and/or breastfeeding. * Fungal infection in the mouth * Poor oral health, such as caries lesions or advanced periodontitis. * Fixed dentures, or orthodontics. * No saliva secretion. * Bisphosphonate drugs, multiple (more than two) medications in use. * Participation in other oral health research at the same time.