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Bad breath is a concern that some people experience during clear aligner treatment. It is not inevitable, and in most cases it is entirely preventable with the right hygiene routine. Here is what causes it and what to do about it.
Why Aligners Can Contribute to Bad Breath
Clear aligners cover the teeth and create a moist, warm environment between the tray and the tooth surface. Bacteria thrive in exactly these conditions. If food debris is present when aligners are reinserted, those bacteria have a food source and produce odour-causing compounds at an accelerated rate.
Aligners that are not cleaned regularly develop their own bacterial film and begin to smell even independently of what is happening with the teeth beneath them. A smelly aligner in the mouth is a significant contributor to breath odour.
Saliva normally plays an important role in managing oral bacteria and washing the tooth surface. Aligners reduce saliva contact with the teeth, which means the natural self-cleansing mechanism is partially bypassed during wear hours.
Hygiene Habits That Prevent It
Brushing your teeth before reinserting aligners after every meal or snack is the single most effective habit for preventing aligner-related bad breath. This removes the food debris and bacteria that would otherwise be sealed under the aligner for hours at a time.
If brushing is not possible, rinsing vigorously with water before reinserting is a reasonable alternative. It is not as effective as brushing but substantially better than simply putting aligners back in immediately after eating.
Flossing daily is also important. Food and bacteria lodged in the gaps between teeth are sealed under the aligner and are a common source of odour. Flossing removes debris that brushing misses.
Keeping the Aligners Themselves Clean
Clean your aligners at least once a day, morning and night if possible. A soft toothbrush with cool water and a small amount of clear unscented soap removes the bacterial film that builds up on the inner and outer surfaces.
Aligner cleaning tablets, designed specifically for this purpose, can be used for a deeper clean and help with both hygiene and maintaining clarity. Soak according to the product instructions, rinse thoroughly, and reinsert.
Dry Mouth and Aligners
Some people experience increased dry mouth during the early weeks of aligner treatment. Reduced saliva flow is a significant driver of bad breath because saliva is what neutralises bacteria and washes the mouth. Staying well hydrated by drinking plenty of plain water throughout the day helps combat dry mouth considerably. Sipping water while wearing aligners is encouraged.
Frequently Asked Questions
Why do my clear aligners smell?
Aligner odour comes from bacterial build-up on the tray surface. If aligners are not cleaned daily, a biofilm of bacteria develops and produces the same odour-causing compounds that cause bad breath. Clean aligners thoroughly at least once a day.
How do I get rid of bad breath from aligners?
Brush your teeth before every reinsertion, clean your aligners daily, floss regularly, and stay well hydrated. These four habits address every common cause of aligner-related bad breath. If bad breath persists despite good hygiene, mention it at your next check-in as it may indicate a dental issue unrelated to the aligners.
Can I use mouthwash to clean my aligners?
Coloured mouthwash can stain aligner plastic and is not recommended for soaking. Clear, alcohol-free mouthwash used briefly as a rinse is generally fine, but dedicated aligner cleaning tablets or clear soap and water are better cleaning options.
Do aligners cause dry mouth?
Some people experience increased dry mouth, particularly in the early weeks of treatment. Staying well hydrated and sipping water throughout the day helps significantly. If dry mouth is severe or persistent, mention it to the clinical team.
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