Hi, well the best option of course is to visit a professional dentist, but if you don't have that option at the moment, I can recommend reading about tooth decay symptoms here
https://villagedentalmedicine.com/tooth-decay-symptoms-and-treatment/ . Learning about tooth decay symptoms on the Village Dental Medicine website will help you identify this problem early and see a doctor in a timely manner. Knowing the symptoms will help you take better care of your oral health, preventing complications and keeping your teeth strong for years to come.