As anyone who's squirmed through a root canal or forked over thousands to their dentist for crowns and fillings will tell you, looking after your choppers is well worth the investment. Bad teeth can cause a world of pain, both physically and financially, so you want to make sure that your daily brushing is getting the job done properly.

Battery-powered or rechargeable?

Rechargeable toothbrushes have a built-in battery pack that you can recharge from its own AC adaptor; battery-powered ones look just like regular toothbrushes with room for the battery in the handle.

Despite the low initial costs when you buy a battery-powered toothbrush, we find no battery-powered models are as good compared to most of the rechargeable models. It's also worth considering the cost and environmental impact of throwing away alkaline batteries. (Using rechargeable batteries can help minimise this.)

We find rechargeable electric toothbrushes just over $3 per year in power, while the battery-powered toothbrushes can cost up to $27 per year in replacing batteries.

Rotation, oscillation or vibration

Some toothbrushes just have a vibrate function, which aren't as good well for teeth cleaning. Toothbrushes with a rotation oscillation action have been found by the not-for-profit Cochrane Collaboration to "reduce plaque and gingivitis more than manual tooth brushing".

Features to look for

Charge indicator light
This shows when you should recharge your toothbrush – useful if you take your brush away on holiday or regularly unplug your charger.

Speed
Different speeds easily accessed from the front of the brush can make it easier to choose your preference.

Timer
A timer that indicates when to move the brush to a different part of your mouth, or when you have passed the recommended two-minute clean.

Pressure sensor
This can prevent gum damage by reducing the movement action of the toothbrush if you press too hard.

Indicator bristles
When it's time to replace the toothbrush head, the bristles slowly fade to white, losing their colouring

Range of heads
Choosing a brush with a range of heads can help you give the best brush possible, with options including interdental (between individual teeth), tongue-cleaning and teeth-brightening styles.  Some people find that a smaller circular head offers better access to back teeth.

Brush head container
Useful for families or couples who share one electric brush, each with their own brush heads.

Beware a head that can't be replaced!
Brushes that don't allow you to change the head will mean you have to replace the entire unit up to four times a year.

Can I use an electric toothbrush if I have

Orthodontic bands?
Brushing is very important if you have bands on, so an electric brush could help here, as long as you don't dislodge the wires or brackets. The Australian Dental Association recommends discussing it with your orthodontist, as it's usually decided on a case-by-case basis.

Dentures?
Electric brushes can be useful for cleaning properly, particularly if you also have poor manual dexterity.

Implanted teeth?
A recent survey found rotation oscillation brushes were good for cleaning implanted teeth, but still discuss your individual situation with your dentist.

Cost

They range in price from $30 to $300.