• Grouping of participants: Patients will be diagnosed to find carious molars reaching dentin level. Participants will be divided to two groups randomly according to the type of liner that will be placed and sample of dentin that will be taken before placement of liner and after placement (6 months); D1 Dentin sample before and after treatment with light-cured Calcium Silicate (Theracal) {n=48}, and D2 Dentin sample before and after treatment with light-cured Calcium Hydroxide ( Biner LC){n=48}.