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It is common for a sore on the tongue to become less painful, and harder - and typically "whitish" during the process of healing.This is the process of a minor injury scarring during the healing. If you can send a picture I'd be happy to offer a more detailed opinion. But, if the area was previously sore and is now hard but not uncomfortable (a week or so later) the area is likely in the process of normal healing. The injury may have been the result of inadvertent biting of the tongue - it's difficult to say. But if it is no longer sore I would recommend giving healing an opportunity for a ten day period. I expect the issue to disappear on its own by then. If not, you'd be smart to have your dentist take a look. Chances are, that won't be necessary in ten days.
Please let me know if you need additional information to answer your question. Otherwise I'd appreciate a positive rating for my effort.
Please let me know if you need additional information to answer your question. Otherwise I would appreciate a positive rating for my effort.