Teenagers often face a unique set of challenges when it comes to skincare, including hormonal changes that can affect the skin's moisture balance. Lip care is an essential part of the skincare routine, and lip serums can provide the necessary hydration and nourishment. Here are some of the best lip serums suitable for teenagers:

1. Fresh Sugar Advanced Therapy Lip Serum: This serum is formulated with Acai Palm Oil, which helps to maintain moisture and promote healing. It also contains a blend of antioxidants to protect the lips from environmental stressors.

2. Burt's Bees Overnight Intensive Lip Treatment: This lip serum is 100% natural and provides long-lasting moisture for up to 8 hours. It's formulated with natural Ceramides, which help to improve the skin's barrier function and retain moisture.

3. Clarins Instant Light Lip Comfort Oil: This lip serum is enriched with plant-based active ingredients that nourish and soothe the lips. It has a non-sticky formula and leaves a shiny, non-greasy finish.

4. Laneige Lip Sleeping Mask: This lip serum is a leave-on mask that soothes and moisturizes the lips overnight. It's formulated with Berry Mix Complex and Moisture Wrap technology, which help to lock in moisture and provide long-lasting hydration.

5. Kiehl's Buttermask for Lips: This lip serum is a deeply hydrating and nourishing treatment that helps to restore the lips' softness and smoothness. It's formulated with Coconut Oil and Wild Mango Butter, which provide intense hydration and repair the lips' moisture barrier.

Remember, everyone's skin is different, so what works for one person may not work for another. It's always best to patch test a new product before applying it all over, and if any irritation or adverse reactions occur, discontinue use immediately.