Hello, normal tongue is relatively flat across its length but finding single or multiple grooves on top surface of tongue might be fissured tongue. This can be shallow or deep. However, it is not Good idea to diagnose yourself because some people may have an underlying condition which doctor need to rule out. If it is deep and looks unusual please consult a Dentist
Next Steps
Kindly visit us at Dental Galaxy Pune for consultation or treatment http://dentalgalaxy.in/
Health Tips
Try to visit a dentist at the earliest. Maintain oral hygiene so debris doesn't get stuck in the grooves.