## 1 Introduction  
Cervical dentine hypersensitivity (CDH) is defined as a short and sharp pain at the exposed dentine [1, 2], which results from mechanical, thermal, osmotic, chemical, and/or evaporative stimuli. Characteristically, it is not associated with any other pathologic condition [3] related to the tooth or the periodontitis. Gingival recession is a key predisposing factor [4] for CDH. The exposed dentinal surface is a consequence of gingival recession and may result from various etiological factors [5] or combinations [6] of these factors. Attrition,abrasion, abfraction, erosion, and attachment loss [7] are the most important causes of CDH. Abrasive cleaning agents [8] can aggravate cervical abrasions. The prevalence of CDH is between 3% and 98%. The age of patients with first-time CDH ranges between 20 and 40 years [9; 10]. Patients may exhibit a higher prevalence of CDH (72.5%-98%) [11] after periodontal treatment. A recent epidemiological study [9; 10], including 3187 European patients, reported variability in CDH prevalence among different countries (from 7.5% in Latvia and Estonia to 19.4% in Spain). Sex was also considered an influencing factor [12], with women showing a higher prevalence compared to men (60% vs. 40%). Buccal cervical surfaces of permanent teeth are the most frequently affected. Canines, premolars, and incisors are more frequently affected than molars [1; 13]. Due to better prevention and longer life expectancy, an overall increase in CDH can be expected in the future with more emphasis on dentine hypersensitivity. Based on the degree of discomfort, CDH may influence the quality of life (QoL) [14]. Knowledge about the influence of dentine hypersensitivity on oral health-related QoL (OHRQoL) is incomplete and requires further research. Clinical relevance oral diseases can lead to physical, psychological, and social disability [15]. The OHRQoL is a component of QoL. Validated questionnaires for the evaluation of oral health and the related quality of life [16] were developed, as these factors could not be analyzed clinically by the dentist alone. [PERSON] and [PERSON] [17] developed the Oral Health Impact Profile (OHIP)-49 questionnaire to record multiple oral complaints and their influence on the OHRQoL. The 49 items of the OHIP can be used to evaluate and investigate psychometric characteristics and various dimensions of oral health. The English version of OHIP-49 was translated [18] into German in 2002. The OHIP-49 questionnaire is suitable for worldwide investigations [19], as it is currently available in many languages. Evaluations of the OHIP-49 have already shown that CDH is significantly correlated with the OHRQoL [20]. The Geriatric/General Oral Health Assessment Index (GOHAI) [21] is an additional questionnaire for the evaluation of the OHRQoL. It was developed by [PERSON] and co-workers in 1990. It is a 12-item self-administered questionnaire [22] that considers more functional aspects than the OHIP-49. The main ingredients of the Pro-Argin(tm) technology are arginine in a concentration of 8% and calcium carbonate. In this combination, the hardly solvable calcium carbonate particles adhere to the highly solvable amino acid arginine. Both build together with bicarbonate, the basis of this technology, and can reduce the CDH by falling out on the surface and obliterating the dental tubules. After application and interaction with saliva, precipitates a mixture of arginine, calcium, bicarbonate, and phosphate, which adheres to the exposed dentin surface and the inner surface of the dentin tubules. Thus, the dental tubules obliterate, and an acid-resistant protective layer [23] is formed on the dentin surface. A previous paper [24] showed that the application of prophylaxis products containing 8% arginine led to significant relief over 24 weeks when compared with control subjects.