Pricking Sensation, Numbness On The Tongue, Occasional Burning On The Cheek And Under Tongue. Reason?

i have a pricking sensation in the left side of my tongue some time during the day and at times numbness. some time i also get burning sensation in the left side of the cheek or underneath the tongue. i have been using Daktarin oral gel for the last four weeks as recommended by the dentist doctor .On his advice i am taking one tablet of neurobion and folic acid daily. But no improvement. what could be the reason for this tingling sensation? what should i do? =email address YYYY@YYYY