While a weave affords you a lot of versatility and protects your hair at the same time, you can't neglect your own hair while wearing one. Taking care of your hair when it's weaved away will ensure that once the weave is removed, the new growth is healthy and lush. So when you're wearing extensions, you still need to do the following for your hair under the weave.
Shampoo & Condition
Yes, you need to shampoo your hair on a regular basis even while wearing any kind of weave. In order to clean everything, you want to concentrate the shampoo on your scalp and massage it in with the balls of your fingertips. Then work the shampoo down the weave hair, but don't ball it up on the top of your head. Instead, work your fingers straight through the hair to the ends. Let the water help guide the shampoo down. It's important to keep the weave hair as straight as possible, in order to prevent matting and tangling.
Apply Oils to Your Scalp
Your hair and scalp still need some kind of nourishment while they're protected beneath a weave. Part of this is regularly working natural oils under the weave onto your scalp and massage them in. If the weave is made of human hair, getting a little product on it won't hurt it. Synthetic hair, however, doesn't require additional products, so it's best to avoid oils altogether if that's the type of weave you have installed. If you're going to be using one, though, an applicator bottle with a nozzle tip will help out a lot. It'll direct the oil where you want it to go without getting it on the rest of your hair. For this particular endeavor, you'll want to stick to lightweight formulas like jojoba or argan oil.
Don't Neglect the Weave
While you're focused on caring for your own hair, you should be focused on caring for the weave hair as well. Just because you'll eventually remove it doesn't mean you can neglect it. Outside of cleansing, weave hair needs to be combed regularly so that it doesn't tangle excessively or mat. It should be secured at night, either under a satin cap or scarf. Human hair weaves can be treated very much like your own hair, and this includes applying products and heat; like your natural tresses, though, you shouldn't use heavy products or too much heat when styling.
Remove the Weave as Recommended
Your hair will likely grow about ½ to 1-inch beneath the weave. Near the end of the recommended time frame for wearing it, the hair growth will make it a little looser. Listen to your stylist's advice on how long to leave a weave in. If you extend your wear too long, not only will your weave begin to look old and ragged, your new growth may begin to mat and loc.
Hair weaves allow you to get just about any style or color you can imagine, so take advantage of the versatility, but make sure to care for your own tresses. Remember, the weave will be gone one day, but you'll still have your hair, so treat it well even underneath your weave or extensions.