Hello @mommacandy !
I made sure I went to the dentist before my treatment began and he said he was so happy I did because most don't say anything and end up with mouth/teeth issues after treatment ends. He highly recommend biotene mouth rinse for dry mouth. I just used the generic brand. He also recommended xylimelts. You place them in your mouth and they stick to your gums or teeth. You can even sleep with them in. They dissolve over time and keep the moisture in your mouth. I was nervous the first time I used them at night but they worked. He also said what you already said which is to limit the acidic/citrus foods.

As far as your hair goes I think it's wise to get it cut short before you start losing it. The day before my appointment I lost a lot in the shower and I could just slightly pull and the hairs would come out. That made me ready to get it cut short. The lady who cut mine said never to shave it completely off because then you end up with ingrown hairs. I was fitted for a wig ahead of time so after she shaved me she put my wig on. I never had to announce to the world that I had cancer. The wig made me feel much more confident. I bought scarves and hats but only wore the hats when I worked on my yard so I wouldn't get my wig all sweaty. My eyebrows/eyelashes were the last to go. I bought a bunch of things for that time but they grew back so fast that I didn't have to draw eyebrows on but a few times! You've got this! Lots of people sending good vibes your way and praying for you!