A tractor unit pulling a semi-trailer. A truck pulling a semi-trailer using a trailer dolly. A semi-trailer is a trailer without a front axle. A large proportion of a semitrailer's weight is supported by a tractor unit, a detachable front axle assembly known as a dolly, or the tail of another trailer. A semi-trailer is normally equipped with landing gear (legs which can be lowered) to support it when it is uncoupled.
Bleeding, redness, and painful or sore gums can be a symptom of gingivitis (inflammation of the gums) that arises due to a number of different causes. Bleeding of the gums is sometimes referred to as gingival bleeding, and it may occur during brushing or flossing. The soreness can be accompanied by swelling of the gum tissues. Most commonly, gingivitis is the result of plaque buildup on the teeth around the gum line.
âImagine your scalp bleeding when you brush your hair.â In other words, if your gums are bleeding when you floss or brush your teeth, you have periodontal disease, commonly known as gum disease.