Actually, teeth are not bones. They are their own anatomical structures. Because of how hard they are, they are often referred to as being “bony”, but that’s to do with their strength, appearance and mineral content, and not to be confused with actual bone.
Starting from the inside and working outwards, teeth are made of pulp (the soft part where the blood supply and nerves are), the cementum (a bony, meaning bone-like, NOT bone, tissue which is where the tooth is anchored in the jaw), the dentin (a kind of mineralized connective tissue which is a bit harder, and protects the inner layers), and the enamel (the outside layer, which is made up mostly of minerals and which is the hardest substance in the human body).
One of the hallmarks of teeth is that they do no regenerate. You are correct in your assertion that bone regenerates, but since teeth are not bone, they do not do that. Good dental care can slow tooth decay and loss, but it cannot reverse it. On the other hand, bones are constantly regenerating, as evidenced by the fact that a broken bone will mend itself, even if it is not set properly.
Your best bet for holding on to your original pearly whites is to floss regularly and brush at least twice daily with a fluoride toothpase, as fluoride helps combat tooth decay. Also, see your dentist twice yearly for cleanings, and have any cavities or other problems taken care of promptly, to keep them from getting worse. As I noted above, teeth do not regenerate, but they certainly will deteriorate at an amazing rate if you aren’t careful. That’s why it is important to take as good a care as possible with them. Dental problems, when left untreated, can cause all sorts of other problems. For example, it has long been known that the leading cause of heart infections (actual bacterial infection inside the heart) is oral infections which are not controlled promptly. I have had heart surgery, so I have to take antibiotics forever when I have even a simple dental cleaning. They are also finding that gum problems, which tend to be part of dental problems in general, have a great effect on the entire health of the body, and it is believed that they can be responsible for infections in other, remote areas, such as the stomach.
I hope that helps clarify things for you.

Teeth are not bones. Teeth are teeth. Bones are bones.

Teeth are not bone. Teeth can not regenerate. They can some what recover from past bad treatment but it takes a very long time. Gums are just as important as the teeth. Look on the internet for the structure of teeth to find all the science of teeth.

Your cavity isn’t getting smaller, you got food stuck in it. I think maybe you should take yourself to the dentist…PS. If your dentist does not recommend filling your cavity, then he is a QUACK!!!

teeth is the only part of our body that cannot regenerate..u should take care of it with brush it after u eat and before go to bed..and also dont use mouthwash..it affect your mouth ecosystem

Alas, teeth can’t regenerate damaged parts. Once you have a cavity, it is not going to heal itself or even get smaller. Your best bet, as others have mentioned, is to get into a regimen of good home care, a diet low in sugars and starchy carbohydrates, and regular professional care.
However, an exciting topic in stem cell research is organ regeneration, and this has extended to regeneration of teeth. The groundwork is being laid now, so perhaps our grandchildren will be able to benefit from this amazing possibility!
See the link below for more info.