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No. It is not acceptable to wear open-toed shoes while working in a restaurant. That is a safety issue.
yes, close-toed shoes are required in the dental office. You would want them all leather as well. Close-toed shoes are to prevent you from catching any infectious disease, for example from a contaminated sharp instrument they may have accidently dropped.
Close toed shoes
To protect your feet from spillage! Canvas will draw liquid to your feet, leather repels.
Close toed shoes with an inch to an inch and a half heel.
Scientists wear closed toed shoes during labs to protect their feet from objects and substances that might be dropped, spilled, splashed, etc. Where the objects might be particularly heavy they may even choose to use "steel-toed" shoes to protect their toes from crushing.
The ancient Chinese had closed toed shoes thousands of years ago.
Closed toe
Composite toe shoes that meet the performance standard for safety footwear provide protection at least equivalent to that of steel toed shoes. In that sense, they are at least as strong as steel toed shoes.
Yes.
The only dress requirements are that you must not be exposing any of your private areas, and that you must wear close-toed shoes.
Steel toed shoes and composite toed shoes are in general manufactured to the same safety specifications set forward in the national or international safety standards, so both types should be equally safe. Steel toed shoes tend to exceed the safety standards more than composite toed shoes, however this all depends on the quality of the material used by the toe cap manufacturer. Steel toed shoes may conduct electricity or heat so extra caution has to be taken there.