Have fitness questions? Fitz has your answers. Our ThatsFit.com fitness expert -- and now your own virtual personal trainer -- will help you get fit, increase your overall health and do it in a fun way. Drop your questions here in the Comments section below and we'll choose one per week to publish on That's Fit! Learn more about Fitz here.

Q. When I go walking with my friends, I notice that I often sweat and it shows through the back of my shirt and armpits. I know sweating is good, but not when I'm the only one who looks like that while walking with other ladies. It is really embarrassing. What can I do? Lorraine

A. My dear Lorraine, I understand where your stress is coming from. Sweat is rarely considered womanly, pretty or delightful. The thought process on sweat makes regular folks think it's gross. Allow me to share my thoughts and experiences on the subject.

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We all want a set of beautiful pearly whites, don't we? But a white smile goes well beyond appearances; strong, healthy teeth are important for your overall health.

For sparkling white teeth, in addition to proper oral hygiene, avoid foods that can stain. The general rule of thumb is if it can stain a white t-shirt, it can stain your teeth. Coffee, red wine, and tea are common culprits.

But there are plenty of foods you can add to your diet to improve the health of your teeth. And -- bonus! -- the foods that are good for your teeth are good for your general health as well. Check out the gallery for a summary of the foods mentioned in the video.

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Any fitness buff or sports enthusiast will know what I mean when I say moisture-wicking fabrics have a stinky problem. Sure, they're wonderful when you're jogging or working out at the gym; they pull sweat away from your body instead of letting it cling to you like a cotton t-shirt does. But those moisture-wicking shirts and shorts and socks have a downfall... they are the pack rats of sweat.

The same problem holds true for many sports uniforms. I know my son's nylon soccer uniform can come out of the wash with all the grass stains removed, but sometimes there's a lingering aroma quite different than the spring-fresh aroma my laundry detergent touts.

There are plenty of options for getting your workout clothes or sports uniforms looking and smelling perfectly clean. Specialty sports detergents are designed for performance fabrics. And other laundry additives can boost the cleaning ability of your normal detergents. Check out the gallery for some ideas.

Want whiter and brighter teeth? Look no further than your food. Grab an apple, some carrots, a cucumber now and then and you'll scrub your stains away. It's the abrasive or crunchy quality of these foods that do the trick, says Elisa Mello, DDS, a cosmetic dentist in New York City. Items to avoid: Red wine, coffee, and cola, which may darken your pearly whites.

Another cleaning trick, says Mello for Woman's Day magazine (July 8, 2008), is to sip staining beverages through a straw and then chase with plenty of water to prevent them from leaving a mark.

For more tips on eating for healthy teeth, check out fatfreekitchen.com.

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I am a hair dye enthusiast -- I love to color my hair. While some do it to cover gray or because they've always dreamed of being a blond, brunette or red head, I do it because I love that it's a non-permanent way to considerably alter the way I look. Well that, and also due to the fact that my normal hair color is an extremely unappealing shade of mousy, ash-brown.

While I'm happy to shell out a fair-sized amount of cash to have my hair done professionally for special occasions, I can't afford to pay expensive salon prices every time I decide I need a change. I imagine this is the case for most of you fellow dye fans out there. I know that many hairdressers will try to persuade all of us that home hair-coloring kits will forever destroy our hair, but I also know of a few who will admit that many of the products currently on the market do a pretty decent job at a much lower price.

Having said that, if you do decide to try the DIY method, it is important to do a little research beforehand as the onus is on you to get it right. A botched at-home job will end up costing even more when you have to go to a professional to fix the splotchy, orange mess you've made of your former crowning glory. With this in mind, it's important to think about the four things listed here before you start the process.

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