>>192672You are talking about female pattern baldness.
Do buy a lot of weed from the nut in the corner? Be careful what chemicals you ingest. Hair thinning is normal as uou get older, but if you notice a sudden change such as hair on your brush you may want to make changes such as changing your diet. You may unknowingly be allergic to some food that is causing your hair to thin or fall out. After puberty the hair is the thickest and strongest it will ever be naturally. There hormones at play amongst many other things.
The hair and the nails are almost best friends. Nails too get softer with age. You can use nails to help diagnose hair inconsistencies. There are oils that can be digested and applied to hair and nails to help strengthen them, but the body is a system.
Yellow teeth are sometimes 10x stronger than white teeth. You can bleach your teeth at a dentist, but you can not grow new teeth. Yellow nails are common but there are fungus that grow natueally in the hair and nails of many people.
Proper treatment, proper nutrition, and exercise can better help determine if you are digesting or in someway absorbing something unknowingly that is bad for you. Consult a toxicologist.