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Experimental design. The specimens were divided into 3 groups (G1- Negative control; G2 – Duraphat® 5000 toothpaste; G3 – Colgate® Pro-Relief. Dentine permeability evaluation was performed at baseline (Stage 1); after 37% phosphoric acid application (Stage 2); after treatment (Experimental Groups- Stage 3); after erosion (Stage 4).
