There are few hair extension option available in market.

Firstly, clip-in extensions are generally considered the least damaging to your natural hair as they don't require any glue, heat, or chemicals to attach. They can be easily removed and put back in as needed.

Another option is tape-in extensions, which use a special tape to attach the extension to your natural hair. These are considered less damaging than other methods as they don't use any heat or glue, but they do require some maintenance to keep them in good condition.

Micro ring or bead extensions are another popular option, which involve attaching small metal rings to your natural hair and threading the extension through them. This method is considered less damaging than some other methods as it doesn't use any heat or glue, but it can be more time-consuming to install.

Ultimately, the healthiest permanent hair extension method for you will depend on your hair type, the condition of your natural hair, and your personal preferences. It's important to consult with a professional stylist to determine which method will work best for you and to ensure that the extensions are installed properly to minimize any potential damage.

However, there are many different brands and types of permanent hair extensions available on the market, each with its own advantages and disadvantages.

One popular brand of permanent hair extensions is Great Lengths, which uses high-quality human hair and a fusion bonding method to attach the extensions. They offer a range of colors and lengths and are known for their durability and natural-looking results.

Another popular brand is Babe Hair Extensions, which offers a variety of methods including fusion, tape-in, and microbead. They use 100% human hair and offer a wide range of colors and lengths to choose from.

Other well-known brands include Hair Dreams, Hotheads, and Cinderella Hair, each with their own unique features and benefits.

It's important to do your research and consult with a professional stylist to determine which brand and method of permanent hair extension will work best for you based on your hair type, lifestyle, and budget.

When choosing hair extensions, it's important to consider the quality, type, and color of the extensions. Here are some tips to help you choose the right hair extensions for you:

1. Quality: Look for high-quality hair extensions made from 100% human hair or high-quality synthetic fibers. Human hair extensions are generally considered to be the best quality, as they look and feel more natural and are more durable. Synthetic hair extensions are a more affordable option, but they may not look as natural and may not last as long.

2. Type: There are several types of hair extensions, including clip-in, tape-in, sew-in, and fusion extensions. Each type has its own pros and cons, so consider your lifestyle, budget, and hair type when choosing the type of extensions you want.

3. Color: Choose hair extensions that closely match your natural hair color for a seamless blend. You can also opt for extensions that are a few shades lighter or darker than your natural hair color if you want to add highlights or lowlights.

4. Consult a professional: If you're unsure about which hair extensions to choose or how to apply them, consider consulting a professional hairstylist. They can help you choose the best extensions for your hair type and provide guidance on how to care for and style them.

   Overall, taking the time to research and choose high-quality hair extensions that match your natural hair color and complement your style can help you achieve a seamless and natural-looking result.