@burcidi-- Yes! My mom had a nail biting problem for years and ever since she started getting gel nail polish manicures, she has been able to grow her nails. It's fantastic!
You can paint over gel nails and also remove the polish but you have to use an acetone-free polish remover so that you don't damage the gel underneath.
With time, a gap will form just like with other fake manicures, but believe me it's better than acrylics. Gel nails take about three weeks for a visible gap, but with acrylics that's two weeks!
There are a lot of colors. I think the best gel nail polish brands are OPI, Gelish and Gelac. I've used all three, they work well.