I noticed this brown dot on my molar this morning. I have Invisalign and wear rubber bands so I constantly see my teeth and this was not there last night. At first I just thought it was food because it looks like it's sitting on top of the tooth, but it won't go away. It doesn't hurt and doesn't feel any different. Is it a cavity? And should I go to the dentist right away? My scheduled cleaning is in March so I don't know if I should wait it out or not.. Thanks!