Inclusion criteria
caries
CARIES
20 healthy volunteers (Caucasian, male/ female) aged 21 to 51 years (mean 27.3 ± 6.3) were selected. Their participation was voluntary confirmed by a written consent. Preconditions were at least 25 teeth free of caries as well as a gingiva free of pocketing (periodontal screening index ≤ 1). The volunteers had to be able and willing to meet the requirements of the test plan. Volunteers were recruited from community.