There are two common ways in which dentine can be exposed; gingival recession and tooth wear. The main cause of DH is gingival recession (receding gums) with exposure of root surfaces, loss of the cementum layer and smear layer.
How do you seal exposed dentin?
For total-etch method: Apply a thin coat of adhesive bonding resin (ALL-BOND 3, Part A and B, BISCO), air thin, then light cure for 10 seconds. Block out any undercuts using flowable composite. Apply a thin coat of bonding resin (ALL-BOND 3), air thin, then light cure.
Dr. Banić