People have mentioned those tiny disposable toothbrushes on other threads, but I thought I'd give one a try for a week, to see if it would hold up for a trip of that length. I was gentle, knowing that I was trying to stretch its useful life from once to 14, and it worked fine. Not like the real thing of course, but well enough. I won't show you the before and after pictures, but I probably could have stretched it a couple more days. The toothpaste dot only lasted for one use, but I carry Dr. Bronner's and use that anyway when I'm camping. No separate toothpaste. The disposable toothbrush also has a toothpick at the end of the handle, so no separate toothpick needed. Weight savings for the disposable over my travel toothbrush + SAK toothpick = 10.6 grams.
But this created a dilemma, because I had intended to use the travel toothbrush as the case for my SAK Classic substitute kit (scissors, tweezers, cut down scalpel) as shown above. What to do, except go through the gear and get creative?
Hikin’ Jim introduced me to Tenacious Tape at the NorCal GGG #1 recently and I was impressed, so I swapped out my yard of 2" ripstop nylon sail repair tape for 20" of 3" Tenacious Tape. And…the Tenacious Tape comes rolled in a little SUL tube/caddy, with just enough room inside the roll to hold all the little SAK Classic substitute bits plus the disposable toothbrush.
At the same time, I decided I wanted a bit more knife than the cut-down scalpel. What I actually use a knife for when camping is to cut cord (rarely) and clean and gut trout. The maximum slicing depth of the scalpel before contacting the handle is 3/4". Pretty shallow for a decent-sized trout. Plus, when the scalpel goes dull, finding a replacement is not easy. The maximum slicing depth for a large Xacto blade is about 1-3/16", so they work better for my primary use, and they’re cheap and easy to find.
But I needed a handle for the Xacto blade, so I carved a small one out of red oak, used a superfine backbone model saw to cut a kerf the thickness of an Xacto blade in the oak, and drilled it for two small brass railroad model bolts to go through the slot in the Xacto blade. I tapered the handle and filed a couple of notches in it, so it can be bound into the end of a split branch to fashion a frog/fish spear or small game arrow point.
Total weight of prior system 18.62 grams. New system 15.49 grams. Less toothbrush, more knife.

The red oak handle, showing the taper and notches

The knives compared

The old kit

The new kit