Torva Dark Brown Bangs Wig with Highlights and No Lace

If you wear it everyday, a synthetic wavy wig should be washed at least once a week

Yes. This wig is heat resistant so up to 180 degrees Celsius is acceptable.

Yes you can but you need to do it a non-traditional way since synthetic hair has a different structure to real hair, and won't hold hair dye. Another alternative is to use acrylic dye mixed with alcohol. Keep in mind this will dry your wig out and you can only dye darker, you cannot lift to a lighter shade. Another alternative is a to use a permanent marker in conjunction with an alcohol swab to blend in any areas and get rid of harsh lines for partial dyeing.