teenage ds 16 has really bad breath at times any suggestions?

[ifyoudonotlikebodenyoumustbeb]

my 16 year old Autistic son seems to get really bad breath all of a sudden i brush his teeth every day he cant take mouth wash just swallowed it when it tried it i have tried all sorts of toothpastes etc a lot of the time it is fine but when its bad its bad any suggestions?

sorry I have only just seen this.
ds is 17(nt) and his breathe can really pong some times, dd(14 cp) does as well.
the mornings is normal, I was told this by the dentist.
can he eat mints?

sinus problems can cause bad breath.

My mum swears by milk of magnesium - apparantly it isn't always teeth/tongue that causes bad breath but the state of your stomach. May be worth a go? Comes in a minty flavour, just a bit chalky.

My husband and one of my sons get 'dragon breath' when they have a cold. In fact that is how I know they are brewing a cold. It's to do with their stomachs reacting differently when they get a cold.

My other son, same father and mother!, doesn't get this at all.

I know this is an old thread, but it's a useful topic.

Go to the dental hygienist my daughter had terrible breath but a quick clean from the hygienist fixed it.

Sinuses can cause badbreath as well

Thanks for the replies he seems to get it all of a sudden and then ok for weeks its weird. I do think its worse when he gets a cold as well it smells like mothballs