Thanks for your query, I have gone through your query. The tingling sensation in the finger tip and tongue can be because of the diabetic neuropathy or secondary to any nerve injury. Nothing to be panic, consult a oral physician and get it evaluated. Mean while you can take nerve regenerating drugs like multivitamin complex like(neurobion). You have to keep the blood sugar level under control. Once the blood sugar level comes to normal, the tingling sensation gradually reduces. I hope my answer will help you, take care.