Numbness in Tongue and underneath the tongue after 3 weeks of wisdom teeth removal, is this normal?

After 3 weeks of removing my left lower wisdom teeth I am still feeling numbness in my tongue and underneath my tongue. Doc made an opening while took the tooth out due to less space. wound is healing fast but numbness is there. Having weird feeling in my tongue. m worried since I read sometimes it never becomes normal. Doctor checked me once and said everything is fine and will recover slowly. numbness is not reducing at all, lips are normal.did not happen when took out right two wisdom teeth.

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