Yes there is a problem. It means that you have a major cavity and you should have your wisdom tooth checked right away. The dentist would either tell you to do a filling on it if it is out enough and if the cavity is not too deep. The other alternative would be to extract it.
If the tooth is well out and the cavity is into the pulp chamber (nerve), you might save your tooth by doing a root canal on it. That needs to be discussed with the dentist.
By Cyberanto
It certainly leaves a big hole in the gum. It will close over in a relatively short time.
If you have a hole in the mouth with a white line around where a tooth use to be mean that you have a tooth coming back in. I would go to the doctor and have them check it out.
it is probably infected
cavity is the hole in tooth
Of course there is going to be a substantial hole, that's the socket where the tooth was. As for the white you are seeing, that would be part of the jaw bone and was supporting the tooth that is now extracted. Your dentist can remove some of it, if you want but its not necessary!
Not necessarily a cavity. May be sensitivity to salt or chemical composition of dissolving foodstoof.
Your friend needs to see a dentist. It is very likely that they'll extract (pull) the tooth because the black hole means that the tooth has rotted out. It also causes bad breath. Bad dental hygiene can cause heart disease.
Eroding away of tooth enamel
The small pin hole in the first molar is the natural opening of the tooth's root canal, called the apex. This opening allows for nerves and blood vessels to enter the tooth to supply nutrients. It is a normal part of tooth anatomy and does not indicate any problem.
Ache (mistake, toothache)
i think you are referring to the lingual fossa.
"Cary" (one r ) is the real, or, medical, term for a hole in a tooth due to tooth decay. These are commonly referred to as "cavities" however a "cavity" technically can be a hole or depression in anything. A Cary is specifically a hole in a tooth.