asthma inhalers, canker sores and juicing

Hello,

My husband has asthma and uses inhalers (ventolin and becotide). Because of these inhalers he is prone to canker sores. The pharmacist has recommended that he rinse his mouth with warm water after using the inhalers, but for some reason he won't do this. For the past few weeks I've been making citrus based smoothies for myself and for him (he doesn't like to eat fruit and I thought this was a good way of getting some fruit into him). My smoothies consist usually of the juice of 4-5 oranges, sometimes a lemon, blended with organic bramble berries or kiwis, sometimes a banana. He has had a terrible canker sore these past few days (along with a cold). I've been reading up on canker sores and the general advice is to stay away from citrus fruit and juice. I'm upset to think that I may have made my husband's condition worse. My belief is that juices are healing, no matter what they are, and I've read that fruits that are acidic become alkaline in the body.

Does anyone have some thoughts on this. Have I made my DH's canker sore come on or worse? I have found two juice recipes on the web for asthma and canker sores:

asthma: 2 oz onion juice, 2oz carrot juice, 2 oz parsley juice, blended together
canker sores: 2 kale leaves, small handful each of parsley and spinach, 4-5 carrots: juice greens with carrots.

I will try these out on him surreptiously - i.e. I won't tell him what they are for and I'll make them for me as well. He doesn't like to take vitamin supplements, and I don't want to force him, so that is out. I think juices are better anyway.

Thanks for listening.
p.s. This is what I found from a medical website:

Aphthous stomatitis [i.e. canker sores]

Pharmacologic agents are among the most common causes of recurrent aphthous lesions, commonly known as canker sores. Some common culprits include nonsteroidal anti-inflammatory drugs (NSAIDs), nicorandil, ACE inhibitors, and bisphosphonates, but any drug can potentially produce an aphthouslike reaction. These ulcerations are round, crateriform, yellowish depressions surrounded by an area of erythema. The size varies from 1-3 mm (aphthous minor, approximately 80% of cases) to larger than 1 cm (aphthous major, approximately 15% of cases). Patients may have outbreaks of multiple ulcerations at one time. These are usually quite painful but typically are self-limiting and resolve in 7-10 days for aphthous minor and 14-21 days for aphthous major lesions.
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