My skin feels so dull and dry. What shall I do to improve it?

Moisturise well and keep yourself well hydrated. You can try hyaluronic acid serums for hydration and vitamin C serums for glow.

My hair gets greasy so fast, within a day of washing. Which shampoo do I use and how many times should I wash my hair in a week?

You can try sebamed sebum regulatory shampoo for greasy hair. It is ideal to wash your hair thrice a week at least.

Best nail care solutions for someone who doesn't get manicures done?

Invest in an ACM nail cream and apply. You should be able to see visible results.

Best wax for normal-dry skin type?

Being a dermatologist, I don't recommend waxing. The procedure can be very traumatic for your skin. If your hair growth is thick, then I would advise laser hair removal.

Can I use lemon juice on my skin directly for acne and skin tightening?

No, please don’t! Direct application of lemon juice may cause contact dermatitis, it is best avoided.