- Soap: it disrupt the skin microbiome. Only useful for hand washing and to clean private parts / the bottom. Even then use high quality soap like Marseille soap or Aleppo soap.
Note: Also as mentioned in the comments if you avoid soap / deodorant you *will* probably need to shower two times a day even without doing physical activities. Three times with physical activities.
You may also need to particularly rub the smelly parts of the body (e.g. the armpits) with a clean sponge, use mild to hot water (cold water doesn’t do it without soap) and trim your body hair. There is no magic. People use soap for a reason: it’s more “practical” and it requires less care to stay clean
And if you are used to wash yourself with soap and you brutally stop you may smell a little the first month until your microbiome is able to handle all the waste and your skin to balance its oil production. Even if you shower multiple times a day.
- Shampoo: Most shampoos are very a agressive for your scalp / hairs and should be avoided. Especially if you have fragile / curly hair. You can wash them with plain water or conditioner instead.
Note: Using a gentle shampoo without silicones and surfactants can still be useful from time to time. Especially to reset the pH of the scalp.
Also using a shampoo rarely and co-washing instead can be impractical if you have long hair as it’s way harder to clean and takes far longer to dry
- Toothpaste: it can be useful but it’s not so important. What really is important is to brush your teeth energetically to remove by mechanical friction the dental plaques and to change toothbrush frequently. Avoiding for a time to use toothpaste and using dental plaque revealer can be a great way to learn how to properly wash one’s teeth
Note: As someone else noted “energetically” means speed and taking your time. *Not* applying pressure on your teeth. Also toothpaste helps the teeth by providing fluoride. It’s just that using it every time may not be so useful and do not replace brushing your teeth effectively