you can take them out when you need to and put them away again. a lot has changed in 30 years! take 1 to 2 servings daily. i welcome you to join me on this journey, sign up for this site, bless me with your comments and celebrate the precious gift of faith through aging eyes. so, what else should you be aware of when making this decision? leave this hair mask on your hair for at least half an hour. in this case, your veterinarian may vary the dose and/or monitor your pet more closely. 