Talk to your doctor about drawing up a self management plan which will show you when you need to take your treatment to keep your asthma under control. There are some golden rules to follow with the help of your doctor or nurse. Use your inhaler carefully. It is easy to rush taking your inhaler but if the full steroid dose does not reach your lungs it will probably end up in your mouth - in which case it won't help your asthma but it can cause side effects. Rinse your mouth out after taking your steroid inhaler.
Some people find it easier to take their inhaled steroid before they clean their teeth.
If you use an aerosol inhaler ask your doctor or asthma nurse for a spacer device. Spacers are an effective way of getting the maximum amount of steroid to reach the lungs instead of lingering around in the mouth. Spacers are available on prescription. If your asthma has been well controlled for many months, discuss reducing the dose of inhaled steroid with your doctor or nurse.