Ideally, you should brush after every meal, because the bacterial attack on teeth begins minutes after eating. At the very least, brush once a day and always.
Scent hounds definitely require multiple baths. The first bath is for general cleaning to take off the dirt and grime. Follow up with the second bath and target.
Flushing the coolant and replacing it with fresh fluid every two years or 30,000 miles is a good rule of thumb, but guidelines can vary from model to model.
How often should you recharge your air-con? Most vehicle manufacturers recommend that you service or regas your car's air conditioning system every 1-2 years.