Hi Rahel,
the tip of my tongue is numb too (I'm also 4 weeks post surgery). Just saw my doc today and he gave a vague "anywhere from 2 months to 6 months" for nerves to come back but that my tongue may never be the same again ( i think that last part was more in response to it's general fuction rather than the nerves).
He sort of implied I was a little impatient - 4 weeks is a really short time smile

Monica,33 Mum of 3. Former smoker
SCC right lateral tongue. Intially thought to be cell dysplasia and dx as SCC after surgical excision.
Nov 2010- partial glossectomy (1cm in width), partial neck dissection. Margins clear, nothing found in nodes- YAY! Benign tumor on saliva gland.