My lips are very dry for some reason I don't know. What remedies can I do about this?

I use this Lip Therapy from Vaseline. Pretty affordable and does the job. From dry, I now have supple puckers. I also do exfoliating by brushing my lips lightly to get rid of dead skin cells. It's also important to drink lots of water! Dry lips is one of the signs of dehydration so look out for it.