Are there any tips for a healthy voice?

Don t abuse. Try to limit your yelling, or talk in loud tone for prolonged periods of time. Certain professionals (teachers, trainers, etc) are prone to do so; and usually it gets better by letting your vocal chords have some rest. Best of luck.
Yes. Drink 6-8 glasses of clear non alcoholic beverages daily, don't talk when your angry, don't scream, thnk before you activate vocal cords. Learn how singers breathe and talk.
Voice coach. It depends on your health. There are medical conditions like thyroid disease can affect the vocal cords.