ඩෙංගු රෝගය ගැන දැනගමු

Collagen is the most abundant protein in your body. It is the major component of connective tissues that make up several...

https://www.youtube.com/watch?v=6TilqdPb-FI

What is tooth enamel? Enamel is the thin outer covering of the tooth. This tough shell is the hardest tissue in the...