Why would the inside of my mouth have areas of grey and black?

Grey or black areas in your mouth could be caused by many things, such as precancerous or benign (non-cancerous) spots, a normal blood vessel, or something called an amalgam tattoo. An amalgam tattoo can appear when a tiny metal particle from a metal filling or dental crown becomes embedded in oral tissue in your mouth. Amalgam tattoos can occur anywhere in your mouth, including the inside of your cheeks, gums, lips, tongue or on the roof of your mouth. An x-ray may be able to confirm a metal particle in your mouth tissue. Your dentist will be able to measure the particle and watch it over time for any changes or issues that may develop.

You may discover a grey or black spot in your mouth, or your dentist or dental hygienist may see it during a routine cleaning or oral cancer check. Caring for your teeth and gums on a daily basis will help you notice any changes in your mouth, including grey or black areas. If you notice any new spots or colored areas in your mouth, be sure to discuss them with your dentist or doctor to determine whether you need further evaluation by a specialist.

The most likely source of the problem is a build-up of tartar that occurs from a lack of professional dental cleanings. Tartar around the teeth and gums can become stained and appear black and grey. I suggest a professional dental cleaning and an examination by your dentist.