Use this text to answaThe Canadian Shield was originally designed for healthcare use.  In this use case, our shield was found to perform best up to 15 times. However, for the average individual, with proper cleaning and care your shields can last far beyond 15 uses. Many of our staff members use the same shield for weeks on end. The most common problems found with all shields after extended use are scratches. However, our shield is made of 0.017” thick plastic — double the thickness of most shields on the market, which means it has the capacity to last much longer.er questions in as much detail as possible for your customers.