* Permanent dental caries rate by lesion level Permanent dental caries rate when lesions causing cavities clinically (from level D3) accounts for 8.3%, and increase up to 31.3% if the carious lesions are treated from D2 level (color changing in wetted teeth and laser index >20). Dental caries rate increases up to 57.9% if carious lesions include also D1 stage (color changing happened after drying 5 seconds and laser index >13) (Table 3.6).