Toothpaste Tubes

We have  usde the same brand of toothpaste over the many years.

However over the past most recent couple of years, I have noticed that    .........

the tubes, when depleted by one fifth or one quarter of the contents,    will suddenly disgorge a quantity of air,    This I have been thinkung of for a while before blogging about it.

Has anyone else noticed this phenomenon. ??

Is it something I can complain to the manufacturers about,  or should I worry that I am not getting full value for the money spent on purchasing these items.??

Has any other person noticed this occurring ??

It does not seem to occur with shaving cream tubes.


Should I write to the manufacturers ??