I think my friend myt hav oral cancer.. help?

my friend has this sore near a tooth that has a cavity. she told me shes been meaning to get it checkd but it slips her mind, i got kinda woried do i lookd it up and i found her symptoms myt be oral cancer. she also has this lump on her in her throat. i felt it and it was like a ball indside her throat. im pretty sure its cancer . shes had that sore in her mouth for several montsh, i dont want to tell her it myt be cancer tho, it myt jsut worry her, despite all the info ive found, i was hoping maybe somone hu actually has experience with this could lemme know more bout it. is ther a chnce it myt not be cancer??? she doesnt smoke cigarettes but occasionally smokes shisha, but i think the cavity could be causing it.. please help