Two answers found: 1) Dentists use cold water when removing old amalgams so that the Mercury vapor and particles so released do not enter the surrounding environment. Cold water is used because warm and hot water causes humidity which carries the mercury particulates in the air. This is not desirable and may have health effects on the patient or dental staff. 2) In general, washing the mouth frequently with cold water strengthens the gums. The contraction of the gums from cold water forms a good bond around the teeth. Warm or hot water causes expansion of the gum tissue. This is not desirable for the majority, if not all, of dental work. One exception found: warm salt water rinses are advisable at times. The warm water expands the gums and lets the salt do its work. Added 8/02/07 : My dentist also explained that the network of tubes used to carry the warmer water used to harbor bacteria and foster it's growth until the change was made to use cold water in those lines to inhibit much of that growth and that it requires less manual or chemical cleaning.
Because if hot water goes down your throat you get a stomach ache
cold water and soap
For fresh-from-the-garden broccoli, soak in cold heavily salted water for 30 minutes to draw out any insects and clean the broccoli. Rinse in clean cold water. For broccoli bought from a store or produce supplier, rinse thoroughly in cold water.
Warm so it won't be cold and so it won't burn my tongue.
hot and soapy water.
No. They might be shocked by the cold water. It may put them off from bathing for a long time, because of a traumatic experience. Always use lukewarm water, never hot or cold. Also a soft bristled toothbrush (not used!!). You can brush their teeth with standard toothpaste, to prevent cavities. That's what I do. I have 16 of them.
In clean and fresh cold water.
Warm water is better for your body. Warm water is also better for your teeth when you clean them.
You get a toothbrush from yoiur local drug store or super market, put a blob of toothpaste onto the brush, run under cold tap water and brush your teeth up and down, then when your done spit all the toothpaste out and rinse. Clean your teeth for 4 mins.