Tongue chewing and cheek chewing are BFRBs or body focused repetitive behaviors
This means that they are addictive but people can stop tongue chewing and cheek chewing. When treating someone with either of these conditions, I begin with a simple review of diet, as this may be a matter of deficiency in protein or vitamin B12. It may also be associated with problems balancing blood glucose levels. Deficiencies are not always diet related and do not always show up on blood tests; this is particularly true in relation to blood glucose. I suggest that people make a note of when the behavior does NOT happen, and that when they find themselves cheek or tongue chewing, that they routinely eat a handful of nuts instead.
Many people find that chewing gum is helpful. Obviously we need to find healthy ways of relieving stress, such as exercise and running is particularly helpful.
Tongue or cheek chewing is bound to be worse if you are tired and without wishing to be alarmist, do bear in mind this could cause irreversible damage to your mouth health and may lead to infection.
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