This is not a Dreamweaver issue, this is a browser issue. Browser's cache data to improve performance on the Internet. For the health of your browser, cached data, history, cookies, etc... should be reset at regular intervals. It's part of computer ownership.
You can add meta tags to the <head> of your documents but honestly this is hit & miss. Your site will take a performance hit because nothing is cached. And some browsers like Chrome may refuse to honor these tags which brings you back to having to force refresh at the browser level.
<meta http-equiv=“Pragma” content=”no-cache”>
<meta http-equiv=“Expires” content=”-1″>
<meta http-equiv=“CACHE-CONTROL” content=”NO-CACHE”>
Alternatively, put an expiration date on files at the server level. Create a new .htaccess file or add this code to your server's existing one. In this example, my site's default expiration date is 2 days except for files like images and fonts that rarely if ever change.
## EXPIRES CACHING ##
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType application/vnd.ms-fontobject "access 1 year"
ExpiresByType application/x-font-ttf "access 1 year"
ExpiresByType application/x-font-opentype "access 1 year"
ExpiresByType application/x-font-woff "access 1 year"
ExpiresByType image/svg+xml "access 1 year"
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType application/pdf "access 1 year"
ExpiresByType text/x-javascript "access 1 year"
ExpiresByType text/javascript "access 1 year"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 2 days"
</IfModule>
## EXPIRES CACHING ##
Post back if you still have questions.
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