Most common cause of tongue numbness is injury to the tongue nerve which could have happen due to dental treatment like wisdom tooth extraction, RCT, placement of dental implant,etc.
Other probable causes are allergies like allergy to some food or drug, nutritional deficiency (Vit B12, Iron), oral infections, burning mouth syndrome, advanced systemic diseases like uncontrolled diabetes cardiovascular disorder etc. Though chances are less but this could also be due to blunt injury to the brain & Multiple sclerosis.
If its a systemic problem apart from tongue numbness you will have involvement of other body parts also. My suggestion is pl consult a dentist to rule out any local cause & physician for any underlying systemic disease.
Meanwhile take care do not accidentally bite your tongue.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.