The SQL NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank. A field with a NULL value is a field with no value. It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.
spot under tongue pierce. Secondly, tongue piercing is another cause of dark spots on tongue and lips. After the tongue piercing has healed, a dark spot is left on the tongue. The piercing also can lead to dark spot on tongue symptoms because the practice promotes fungal infections. More so, at pierce point, normal tongue pigmentation is lost.
According to the Mayo Clinic, white tongue happens as a result of overgrown and swollen papillae on the tongue's surface. Bacteria and dead cells that lodge between the papillae cause the white coating. Numerous causes encourage white tongue, including alcohol and tobacco use, fever, dry mouth and mouth breathing, dehydration and poor oral care. Many causes overlap with the causes of bad breath, including bacteria in the mouth, so it's easy to see how the conditions how the conditions intersect.