I purchased one DryShield unit just to see if it made sealants easier. Then I purchased another. Now I have four because my staff loved using it and our sealants are holding up much longer. We use DryShield for sealants and small restorative cases. Now a single staff member can apply sealants in a few minutes when it used to take two staff members 30 minutes. I am also impressed with the durability of the mouthpieces under the stress of the autoclave. My staff and I have greatly improved our quality and efficiency by using DryShield.