Could be one of several reasons. Poor oral hygiene [ you must clean your tongue and gums as well as teeth]. Chronic dehydration, or a vitamin deficiency. You Doctor or Dentist can tell you more on examination.
Spleen Qi Deficiency causes indentations or what looks like tooth marks on the side of your tongue. Symptoms include:
Lethargy Dizziness Tired eyes Dislike cold greasy foods Headache after exertion...
Cuts can be related to canker sores, (ulcers on your tongue). There are a number of causes including stress, immune system problems, vitamin deficiencies and local trauma in the mouth.
Salt water...
If it's a really bad cut which won't stop bleeding you may have to see a doctor, but if it's just a regular cut it's nothing to worry about. Although tongues appear to bleed heavily when a cut has...