How can I fill grooves on a kitchen table?

Use Oilcloth Tablecloth.

Bar top epoxy would be a great idea, plenty of tutorials on how to use. Another idea would be to go to a local TAP Plastics and have them cut a piece of lexan or acrylic to fit over and then tack in place with a bit of lexel or other clear flexible adhesive.

If you are doing this every meal, why not just cover the table with a clear plastic tablecloth while you eat? Clean it after eating, then remove it. Think of the time you are spending doing the same thing over and over that could be used to something more productive.

If the table is not expandable look into having a piece of tempered glass cut to fit. If you cover it with epoxy you may not get smooth edges, but you may be able to work around that. Also, you need to have a good idea of the volume of epoxy necessary to cover the entire table, I think this has to be done in one shot but I do not have actual experience with this. Research it on YouTube.

Better than glass would be a clear acrylic tabletop. These are relatively cheap and do not hide the beautiful wood finish. They are sold online and at your local home and department stores. Good luck!

Maybe you could use a dust-buster to clean the table.

I had a coffee table like that. I finally measured and had a.plate glass cut to fit and had them bevel the edge so no one got cut on it. Best thing I ever done with a piece of furniture.

A clear acrylic sheet would cover the table top and allow the finish to be seen. You could design the top to allow for expansion when needed ( cut down the middle width wise and add a piece to the center when expanded) The expansion piece could be stored under a mattress.

You could use a brown crayon to fill the cracks or furniture scratch cover wax.

I had a dining table with a groove completely around the table edge. I had to clean it too. I used my wash cloth and just dragged it. It took two minutes. I used a butter knife to drag the cloth. Lucky I only did every other day. You could also vacuum.

Wood filler/putty comes in colors... I'd use one the shade of the darkest wood, fill the gaps, smooth with a tool or your finger, sand and seal with a poly or whatever the mfg of the putty recommended

Why don't you get a piece of glass cut to fit that tabletop? You can still enjoy the appearance of those planks and keep food debris from falling in between.

There are a few different ways you can fill grooves or scratches on a kitchen table:

1. Use wood filler: Wood filler is a substance that is specifically designed to fill in gaps and scratches in wood. It is available in a variety of colors to match different wood tones and can be sanded down once it has dried to create a smooth finish.
2. Use wood putty: Wood putty is similar to wood filler, but it is typically softer and easier to work with. It is also available in a variety of colors to match different wood tones and can be sanded down once it has dried.
3. Use a furniture repair marker: Furniture repair markers are pens filled with colored wax that can be used to fill in small scratches and gaps in the wood. They are available in a range of colors to match different wood tones, and the wax can be blended and buffed to create a seamless finish.
4. Use a furniture touch-up pen: Similar to a furniture repair marker, a furniture touch-up pen is a pen filled with colored wax that can be used to fill in small scratches and gaps in the wood. They are available in a variety of colors to match different wood tones, and the wax can be blended and buffed to create a seamless finish.

I hope this helps!