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.
If you think tea tree oil may be your cup of tea for treating scalp problems, try a shampoo or other product that's 5 percent tea tree oil and use it daily [source: Slawson ]. However, because tea tree oil is largely untested as a treatment for scalp problems, pay close attention to possible side effects.