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If your cold sore lasts longer than 7-10 days or doesn't improve in that time, definitely visit your dentist. Cold sores are viral so you might not want to take a chance on passing it on. Also, if you get chronic cold sores, it may be caused by eating too many acidic foods (oranges, tomato sauce) or by using toothpaste high in Sodium Lauryl Sulfate (SLS).
I have braces and get cold sores all the time!(I have 5 right now!) Just go to walgreens or some and by so stuff to put on it. It turns into a ball, and they have to do an operation. My friend got one. I've used SM33 in gel form - this is the one to use for mouth ulcers etc. It puts a film over the top and keeps it drier. I remember reading that cold sores are caused by a virus that is difficult to kill, so it keeps coming back.
I tried cutting a sliver of raw garlic and holding that against the cold sore. It did sting for a few seconds but I did that several times a day for a couple of days. It healed quickly and although I have felt the "tingle" since it has not come back for a while now.
Do you want to discover the fastest and most effective cold sore cures? If yes, then I suggest you get a copy of the Cold Sore Free Forever book.
Follow this link ==> http://coldsoreoff.com/