1 Cook for 15 to 20 minutes (depends on size of roast) at 450 degrees F. 2  Then, without opening the oven door, turn the heat down to 325 degrees F. 3  Cook until meat thermometer inserted reaches about 140 degrees. 4  Generally this should take about 2Â½ to 3 hours, but it varies on oven and roast size.
Tea tree shampoo uses vary. If you have scalp conditions such as dandruff or head lice, tea tree shampoo may benefit you. If you are trying to stimulate hair growth and want to feel refreshed after shampooing, tea tree shampoo might be just the right product for you. Some people recommend using tea tree shampoo for pets.
Tips. 1  Dilute the tea tree oil in the shampoo to protect your skin. A 100 percent solution of tea tree oil can cause scalp irritation such as dermatitis, which can make hair follicles swell and cause the hair to fall out. 2  Add a base oil, like olive oil, to natural tea tree oil when treating the scalp for infections, such as dandruff. This helps protect the skin from developing a rash or irritation, which can adversely affect hair follicles.