How to Shave Back Hair?
The quick answer to your question is no. Shaving will neither make your hair grow back thicker nor darker, nor grow any faster. Additionally, shaving does not increase the diameter of your current hair follicles or grow back hair that you have lost (these factors are largely determined by genetics).
With new hair growth, the short hair shaft will be more noticeable, since it now has a blunt tip due to shaving, as opposed to the normal tapered tip. This may make your re-growth seem thicker than your former mane, but your hair won't acutally be thicker than it was before. In addition, the new hair will be healthier and undamaged, because it has not been exposed to the elements, chemical treatments, blow drying, or normal day-to-day wear and tear. By avoiding or limiting the risks of hair damage such as these, you can have an increased possibility of having a healthier head of hair.
If you shave your head to allow new hair to grow in, you will have a bald or buzzed look temporarily. Baldness or a cleanly shaven head was once viewed as a lack of virility in men, as in Samson's hair being equated with his strength, or unfeminine among women. However, things really have changed. Over the last several years, it has become not only socially acceptable, but en vogue and attractive for both men and women alike to crop their locks.
The bottom line is that whether you are bald or have a lustrous mane, it is your confidence in yourself that matters most. If you do decide to keep your hair, healthy grooming choices can make a difference. However, if your hair is not growing back in as healthy looking as expected, perhaps seeing a dermatologist and/or dietitian can help, as some hair problems can be a sign of more serious conditions.