Talk to Dentist on Teeth Problem

Hello, I'm a 19-year-old female and I've recently been facing serious dental issues. My teeth are getting weaker, and I’ve noticed small gaps forming between them. Sometimes tiny pieces break off while eating, even though I drink 2 glasses of milkshake daily and brush regularly. I never had this issue before.

There is no pain or bleeding, but the structure of my teeth feels fragile. I'm worried that this might get worse. Can someone please guide me on whether this is due to a deficiency or some early dental condition? What tests or treatment should I consider?

Thank you in advance.