If yes how long can it be left?n how often can v do it (my hair is very dry and also have hair loss lately)

I prefer to use olive oil, basically like a hot oil treatment. Put about a couple of ounces in a microwave container and warm up, massage through dry hair, wrap in a warm wet towel for about l5 minutes and wash out with your regular shampoo. Do same procedure about four times a month. I am sure the texture of your hair will improve greatly. You are probably seeing 'hair loss' because its so dry it is breaking off, not actually coming out at the root.
Mayo is too messy.

Tick