You can use your toothbrush simply to exfoliate the dead skin cells off your lips. But remember to use gently to avoid hurting your delicate lips. Apply a thin coat of good lip balm after this. Incase your lips are chopped too, and then stick to the same remedy but with the toothbrush coated with Vaseline this time. Massage your lips gently with a good lip balm every night. Also make sure that your drink at least eight glasses of water every day.
During daytime, use lip balm with at SPF is or higher to protect them against glaring sun rays. Follow this routine religiously every day. Try using concealer on your dark lips before wearing your fav lipstick. For better outcome, use a lip linear to outline your lips and then fill them up with lipstick or lip-gloss. Always go for brands as far as cosmetics are concerned.