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Thank you for your fast response and additional information.
I would like to tall you something before i answer your actual query.
Teeth breaking at gum line while eating are not a symptom or oral cancer
They can break as they become brittle as one ages and even when someone bites on something hard they can break off due to biting force and pressure.
Although teeth being loose from the socket is one the symptom of oral cancer (which is why i asked you for clarifications) and one can see entire tooth coming out of the socket and this effects many teeth with in no time.Read more about the symptoms here:
So to rule out such a big disease on this one symptom alone won’t be fair enough!!
Coming to the swelling on his nose:
Any lump or lesion in the body that doesn't heal own its with 3-4 weeks time should be well diagnosed,properly evaluated and biopsied.I am sorry i wont be able to guide you much on it as it out of dental issue, but you should get it evaluated by a physician as early as possible.
hope this answers your question. Please feel free to contact me again if you have any doubts and i will glad to reply to you.