Maintaining your keratin bond hair extensions is crucial to ensure their longevity and keep them looking their best. Here are some tips to help you maintain and care for your keratin bond hair extensions:

1. Brush gently: Use a soft-bristle brush or a wide-tooth comb to brush your hair extensions. Start from the ends and work your way up, being careful not to tug or pull on the bonds.

2. Avoid excessive heat: Limit the use of heat styling tools such as flat irons, curling irons, and blow dryers directly on the bonds. Excessive heat can weaken the keratin bonds and cause them to break down. If you do use heat styling tools, use a heat protectant spray and set them to a lower temperature.

3. Wash with care: When washing your hair, be gentle and avoid rubbing the bonds. Use a sulfate-free shampoo and conditioner, as sulfates can weaken the bonds over time. Avoid applying conditioner directly to the bonds to prevent slippage.

4. Avoid oily or greasy products: Avoid applying oily or greasy products directly to the bonds, as they can cause the bonds to weaken or break down. Instead, focus these products on the mid-lengths to ends of your hair. Also, be mindful of using too much dry shampoo at the root as it can cause the bonds to turn white. 

5. Avoid swimming in saltwater or chlorine: Saltwater and chlorine can cause damage to the extensions and the bonds. If you do swim, wear a swim cap or keep your hair out of the water as much as possible. After swimming, rinse your hair thoroughly with clean water.

6. Avoid pulling or tugging: Be mindful of how you handle your hair extensions. Avoid pulling or tugging on them, as this can cause the bonds to loosen or break. When styling or tying your hair, be gentle and use hair accessories that won't damage the bonds.

7. Regular maintenance appointments: Schedule regular maintenance appointments with your hair extension specialist. They can check the condition of the bonds, reposition any loose ones, and make any necessary adjustments to ensure your extensions stay in good shape.

8. Sleep with care: Before going to bed, tie your hair in a loose braid or ponytail to prevent tangling and matting. You can also use a silk or satin pillowcase, as it creates less friction and reduces the chances of your extensions getting tangled while you sleep.

Remember, proper maintenance is key to keeping your keratin bond hair extensions looking their best and lasting longer. If you have any specific instructions from your hair extension specialist, be sure to follow them for optimal care.