Bruising and Bleeding. Bruising or bleeding after an injury is normal. However, some people have disorders that cause them to bruise or bleed too easily. Sometimes people bleed without any obvious triggering event or injury.
The skin of victims of mustard gas blistered, the eyes became very sore and they began to vomit. Mustard gas caused internal and external bleeding and attacked the bronchial tubes, stripping off the mucous membrane. This was extremely painful and most soldiers had to be strapped to their beds.
Aside from its long track record of success, laughing gas dentists still sweeten the air for several other reasons: 1  Nitrous oxide is safe and easy. Dentists, hygienists, and in some states, dental assistants, may raise your pain threshold with conscious sedation laughing gas. 2  It has dose versatility.