How do I get my dad to stop using my razor?

So I've started noticing lately that my dad keeps using my razor. Every time I go to take a shower, my razor is somewhere different and has hair from his beard on it. It's extremely gross ! Plus, he has his own razor and I don't understand why he won't use his. I've even confronted him and he just acts like its not a big deal. It's even wasting my money because I have to keep replacing it. How can I get him to stop using my razor?

Thanks
How do I get my dad to stop using my razor?
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