Ulcers on tongue can have many reasons. It could be because of injury due to a sharp tooth or eating something hot or
vitamin deficiency etc.It's fine to wait for a few days for it to heal but if it persists for more than a week you should seek help.
Ulcers on tongue are dentists forte.
He would be able to diagnose the underlying cause and treat it accordingly.
Next Steps
visit your dentist.
Health Tips
ulcers can be presentations of cancers too. so give your dentist complete information about your habits like smoking or drinking to help him diagnose you accurately.