Hair and Nails

Q: I'm 15 years old and I have a small beard. My parents have asked me to cut it saying that I'm too young to keep a beard. What should I do?

Q: I was not able to take out one or two strands of pubic hair during shaving. I still made my ghusal for haidh. Was my ghusal valid?

Q: If the nail gets long and were not cut in a week, will the wudu and namaz still be valid?

Q: Is shaving with razors haraam for women in Islam?

Q: I have white hair on my head and beard. Can I use black dye on my hair?

Q: Is threading the upper lip haraam in Islam for girls?

Q: A lady has long hair that she does not cut because it is impermissible. However, over time, her hair has become uneven.

1. Is it permissible to cut the hair so that it looks even (of the same length) from her back when she unties it and puts her hair to her back?
Note that since individual hair strands grow from follicles at different parts of the scalp, making sure the hair looks the same length does not mean that each strand is of the same length. She feels like it is impossible to guarantee that all hair is the same length.

2. She has a lot of split ends and her hair is very dry and unhealthy at the ends. Is it permissible for her to cut the dry part (bottom 3-4 inches) so all of her hair becomes healthy?

Q: I know that women are not allowed to cut their hair. But if her hair grows really long and reaches below the buttocks, is she allowed to cut the excess hair? The hair is really thin at the bottom and looks ugly. 

Q: Can a woman go for permanent body hair removal using laser theraphy? This process destroys the hair follicles. Is this allowed in Islam?

Q: Is it allowed in Islam that a male can tie his hairs on the back of his head?