My 15 year old daughter has a terrible temper. She goes crazy if we dare to say no to her. She kicks doors, walls and throws things about the house. She has smashed my oven door by throwing an object at it in temper. She also hits her sister and hits both my husband and I. We are at our wits end! She is very polite outside and can change her behaviour within minutes if someone comes to the house. She also, swears constantly (which is also getting us down!) and continually calls us abusive names! She can be ok for days , sometimes weeks and we think "she is growing uo" then again it all starts. Any advice?